Home
>
Motorola
>
Portable Radio
>
Motorola Gp328plus Gp338plus Gp338xls Detailed 6804112j28 G Manual
Motorola Gp328plus Gp338plus Gp338xls Detailed 6804112j28 G Manual
Have a look at the manual Motorola Gp328plus Gp338plus Gp338xls Detailed 6804112j28 G Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 249 Motorola manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
Frequency Generation Circuitry5D-9 6.0 Frequency Generation Circuitry The Frequency Generation Circuitry is composed of two main ICs, the Fractional-N synthesizer (U201), and the VCO/Buffer IC (U241). Designed in conjunction to maximize compatibility, the two ICs provide many of the functions that normally would require additional circuitry. The synthesizer block diagram illustrates the interconnect and support circuitry used in the region. Refer to the relevant schematics for the reference designators. The synthesizer is powered by regulated 5V and 3.3V which come from U247 and U248 respectively. The synthesizer in turn generates a superfiltered 4.5V which powers U241. In addition to the VCO, the synthesizer must interface with the logic and ASFIC circuitry. Programming for the synthesizer is accomplished through the data , clock and chip select lines from the microprocessor. A 3.3V dc signal from synthesizer lock detect line indicates to the microprocessor that the synthesizer is locked. Transmit modulation from the ASFIC is supplied to pin10 of U201. Internally the audio is digitized by the Fractional-N and applied to the loop divider to provide the low-port modulation. The audio runs through an internal attenuator for modulation balancing purposes before going out to the VCO. Figure 5-3: Frequency Generation Unit Block Diagram Vo l t a g e Multiplier Synthesizer U201 Dual Tran- sistor Loop Filter VCOBIC U241Low Pass Filter Matching Network Attenuator To Mixer To PA D r i v e rVCP Vmult1Aux3 Aux4 MOD Out Modulating Signal Vmult2Rx VCO Circuit Tx VCO CircuitTRB 16.8 MHz Ref. Osc.Rx Out Tx Out
5D-10Frequency Generation Circuitry 6.1 Synthesizer (Refer to 330-400MHz Synthesizer Schematic Diagram on page 5D-24) The Fractional-N Synthesizer uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz as reference frequencies. Together with C206, C207, C208, R204 and CR203 , they build up the reference oscillator which is capable of 2.5ppm stability over temperatures of -30 to 85°C. It also provides 16.8MHz at pin 19 of U201 to be used by ASFIC and LVZIF. The loop filter which consist of C231, C232, C233, R231, R232 and R233 provides the necessary dc steering voltage for the VCO and determines the amount of noise and spur passing through . In achieving fast locking for the synthesizer, an internal adapt charge pump provides higher current at pin 45 of U201 to put synthesizer within the lock range. The required frequency is then locked by normal mode charge pump at pin 43 . Both the normal and adapt charge pumps get their supply from the capacitive voltage multiplier which is made up of C258, C259, C228, triple diode CR201 and level shifters U210 and U211. Two 3.3V square waves ( 180 deg out of phase) are first shifted to 5V, then along with regulated 5V , put through arrays of diodes and capacitors to build up 13.3V at pin 47 of U201. Figure 5-4: Synthesizer Block Diagram DATA CLK CEX MODIN V CC, DC5V XTAL1 XTAL2 WARP PREIN VCP REFERENCE OSCILLATOR VOLTAGE MULTIPLIER VOLTAGE CONTROLLED OSCILLATOR 2-POLE LOOP FILTER DATA (U409 PIN 100) CLOCK (U409 PIN 1) CSX (U409 PIN 2) MOD IN (U404 PIN 40) +5V (U247 PIN 4)7 8 9 10 13, 30 23 24 25 32 47 VMULT2 VMULT1BIAS1 SFOUTAUX3 AUX4 IADAPTIOUTGND FREFOUTLOCK4 19 6, 22, 23, 24 43 45 3 2 28 14 1540FILTERED 5VSTEERING LINE LOCK (U409 PIN 56) PRESCALER INLO RF INJECTION TX RF INJECTION (1ST STAGE OF PA) FREF (U201 PIN 21 & U404 PIN 34) 39 BIAS2 41 DUAL TRANSIS DUAL TRANSIS-48 5VR5 5, 20, 34, 36 (U248 PIN 5) AUX1 V DD, 3.3VMODOUT U251 LOW VOLTAGE FRACTIONAL-N SYNTHESIZER TORSTORS
Frequency Generation Circuitry5D-11
6.2 VCO - Voltage Controlled Oscillator
(Refer to 330-400MHz Voltage Controlled Oscillator Schematic Diagram on page 5D-25)
Figure 5-5: VCO Block Diagram
The VCOBIC (U241) in conjunction with the Fractional-N synthesizer (U201) generates RF in both
the receive and the transmit modes of operation. The TRB line (U241 pin 19) determines which
oscillator and buffer will be enabled. A sample of the RF signal from the enabled oscillator is routed
from U241 pin 12, through a low pass filter, to the prescaler input (U201 pin 32). After frequency
comparison in the synthesizer, a resultant CONTROL VOLTAGE is received at the VCO. This voltage
is a DC voltage between 3.5V and 9.5V when the PLL is locked on frequency.
Presc
RX
TXMatching
NetworkLow Pass
Filter
Attenuator Pin8
Pin14
Pin10 Level Shifter
Network5V
(U201 Pin28)
VCC Buffers
TX RF Injection U201 Pin 32AUX4 (U201 Pin3)AUX3 (U201 Pin2)
Prescaler Out
Pin 12 Pin 19 Pin 20
TX/RX/BS
Switching Network
U241
VCOBIC
Rx
Active Bias
Tx
Active Bias
Pin2
Rx-I adjustPin1
Tx-I adjustPins 9,11,17
Pin18Vsens
Circuit Pin15Pin16 RX VCO
Circuit
TX VCO
Circuit RX Tank
TX TankPin7
Vcc-Superfilter
Collector/RF in
Pin4
Pin5
Pin6
RX
TX
(U201 Pin28)Rx-SW
Tx-SW
Vcc-Logic
(U201 Pin28) Steer Line
Voltage
(VCTRL)Pin13
Pin3TRB_IN
LO RF INJECTION
VSFVSF VSF
5D-12Frequency Generation Circuitry The VCOBIC(U241) is operated at 4.54 V (VSF) and Fractional-N synthesizer (U201) at 3.3V. This difference in operating voltage requires a level shifter consisting of Q260 and Q261 on the TRB line. The operation logic is shown in Table 5-1. In the receive mode, U241 pin 19 is low or grounded. This activates the receive VCO by enabling the receive oscillator and the receive buffer of U241. The RF signal at U241 pin 8 is run through a matching network. The resulting RF signal is the LO RF INJECTION and it is applied to the mixer at T302 (refer to 330-400MHz Receiver Front End Schematic Diagram on page 5D-22). During the transmit condition, when PTT is depressed, five volts is applied to U241 pin 19. This activates the transmit VCO by enabling the transmit oscillator and the transmit buffer of U241. The RF signal at U241 pin 10 is injected into the input of the PA module (U101 pin16). This RF signal is the TX RF INJECTION. Also in transmit mode, the audio signal to be frequency modulated onto the carrier is received through the U201 pin 41. When a high impedance is applied to U241 pin19, the VCO is operating in BATTERY SAVER mode. In this case, both the receive and transmit oscillators as well as the receive transmit and prescaler buffer are turned off. Table 5-1: Level Shifter Logic Desired ModeAUX 4AUX 3TRB TxLowHigh (@3.2V)High (@4.8V) RxHighLowLow Battery SaverLowLowHi-Z/Float (@2.5V)
Notes For All Schematics and Circuit Boards 5D-13 7.0 Notes For All Schematics and Circuit Boards * Component is frequency sensitive. Refer to the Electrical Parts List for value and usage. 1.Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads (pF) or microfarads (µF). 2.DC voltages are measured from point indicated to chassis ground using a Motorola DC multime- ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with the voltage probe to prevent circuit loading. 3.Reference Designators are assigned in the following manner: 100 Series = Transmitter 200 Series = Frequency Generation 300 Series = Receiver 400/500 Series = Controller 600 Series = Keypad Board 4.Interconnect Tie Point Legend: UNSWB+ = Unswitch Battery Voltage (7.5V) SWB+ = Switch Battery Voltage (7.5V) R5 = Receiver Five Volts CLK = Clock Vdda = Regulated 3.3 Volts (for analog) Vddd = Regulated 3.3 Volts (for digital) CSX = Chip Select Line (not for LVZIF) SYN = Synthesizer DACRX = Digital to Analog Voltage (For Receiver Front End Filter) VSF = Voltage Super Filtered (5 volts) VR = Voltage Regulator 6-LAYER CIRCUIT BOARD DETAIL VIEWING COPPER STEPS IN PROPER LAYER SEQUENCE LAYER 1 (L1) LAYER 2 (L2) LAYER 3 (L3) LAYER 4 (L4) LAYER 5 (L5) LAYER 6 (L6) INNER LAYERS SIDE 1 SIDE 2
5D-14 Notes For All Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK
Circuit Board/Schematic Diagrams and Parts List5D-158.0 Circuit Board/Schematic Diagrams and Parts List B503 B504 C216 FL2011 3 46 40 J2001 TP201 C247 C251 C285C289 C370 C374C386 C248 C273C286 C276 C253 C271 C272 L282 3 L2431 3 L2531 L271L273L321Q261 3 4 Q241R333R339 R243R248 R253R260 SH241TP202 TP302 C210 C211 C212 C213 C214C220 C230 C257C260 C294 C292C229 C282 C283 C203 C217 C235 C228 C233 C238 C297 C291 CR201 L201 L202L203 L232 Q210 3 4 Q260 3 4 R206 R256 R255 SH201 U247C328 C324 C325 C521 C323 C391 C397 FL301L311PB501 PB502 Q315 Q316 R326 R300 R314R316 R318 R319 R325 R327 R334R335 R338 R351 R352 RT300 RT301 SH323 VR300VR440 C375 C320C319 C322 C381 L309L310 R308 R310 R309 R348SH303 T301 3 46T302 3 4 6 16 C109 C110 C114 C119 C122 C166C171 C111 C112 C113 C115 C116 C117 C118 C121 C125 C160 C165 C120 C161 C193 C127 C131 C129 C169 C180 C181L115 L106 L107 L108L109 L113 L114L117 L160 32 Q110 1 R104R106 R107R174 R108 R120 R171R161 R193 R173 SH101 U101 9 8 1 C101 C102 C104 C103 C106C107C188CR101 CR102 L101 L102 L104 L105SH100 C331 C396 C333 CR308 R342 R317 R336C304 C308 C301 C302 C305 C303 CR301CR302 L301 L302 R301R302 SH301 C354 C362 C351C364C352 C349 C350 C353 C363 C384 C385 CR310 L325 L332PB504 Q320 R355 R322 R345R320 R321 R324 R346 SH321VR444 C505 C512 C513 C502Q505 Q502 R506 R507 R505 VR501 C140 C511 C514 C520CR503 2 34 L116 PB505 R502 R501 VR443 C141 330-400MHz Main Board Top Side PCB No. 8404101G02/G03/G04
5D-16Circuit Board/Schematic Diagrams and Parts List 2 S502 35 44 C 8 C S501 2 C108 CR160 1 J101 4 3 2 J102 P100 C132 C173 C172 CR103 CR105 H101 M100Q111 3 4R101R170 R133 R172 C309 C315 C321 C395 C307 C310 C314C306 C311 C380 C312 C318 C313C317 C316 CR304 CR305CR303 L340 L304 L306 L307 L303 L305 Q301 R306 R307 R304 R303 R347 R305R328 R340SH302 C337 C383 C390 C329 C336 C344 C345 C346 C347 C348C334 C356C339 C340 C341 C342 C343 C357 C360 C355 C358C359 C361 C382 L314 L331R343 R350 R344SH322 13 25 37 1U301 M301 B501 321 C327 C503 C338 C326 C330 L330 Q302 R315R311 R312 R313 C130 C138 C151 C170C123 C126 C128 C150 C152 CR306 CR501 E101 F501 L112 R102R329 SH304 VR439 C105 C174 C133C135 C134 R109 R130 R131R132R136 25 9 17 U102 1 C241 C246 C255 C281 C295 C372 C371 C373 C378 C242 C250C243 C244C245 C254 C252 C256 CR241 CR242 CR243 CR251 CR252L241 L242 L281 L251 M300Q310R330 R332R254 R110 R112 R111 R241 R252 R242 R244 R245 R251 R331 R349 SH242U241 10 201 11C201 C264 C218 C223 C224C231 C296C298 C202 C265 C204 C206C207 C208 C219 C232 C234 C258 C259 C263 C293 CR203 L261 R204 R281 R201 R202 R231 R232 R233SH202 13 25 37 1U201 U210 3 4 U211 3 4 C277 C215 C279 C522 C278L505M101 R205 U248VR441 VR442 VR506C523 Y2014 3 2 C526 C528 C530 C532 C534 C536 C538 C540 C542 C547 C552 C555 R509 R510 C525 C527 C529 C531 C533 C535 C537 C539 C541 C543 C544 C545 C546 C548 C549 C550 C551 C553R511 330-400MHz Main Board Bottom Side PCB No. 8404101G02/G03/G04
Circuit Board/Schematic Diagrams and Parts List5D-17 ZMY0131018-O 40 J2001 B503 C216 C282 C283 C210 C211 C212 C213 C214C220 C230 C257C260C294 C292 C229 C203 C217 C235 C228 C233C297 C291 CR201 FL201 1 3 4 6 L201 L202L203 Q210 3 4 Q260 3 4 R206 R256R255 SH201 TP201 C238 L232 U247 B504TP202 TP302 C391 C328 C324 C325C521 C323 C397 FL301L311PB501 PB502 Q315 Q316 R326 R334 R335 R338R300 R314 R316 R318 R319 R325 R327 R351 R352 RT300 RT301 SH323 VR300 VR440 C381 C375 R310 C319 C320C322 L309L310 R308 R309 R348SH303 T301 34 6 T3023 4 6C333 C396 C331 CR308 R336 R342 R317 C247 C251 C285 C289 C370 C374 C386C248 C273 C286 C253 C276 C271 C272L282 3 L2431 3 L2531 L271 L273 L321 Q261 3 4 Q241 R333 R243R248 R253 R260R339 SH241C109 C110 C114 C119 C122 C166C171 C 111 C112 C113 C115 C116 C180 C117C118 C121 C125 C160 C165 C120 C161C193 C127 C131 C129 C169 C181 L115 L106 L107 L108 L109 L113 L114L117 L160 32 Q110 1 R104R174 R106 R107 R108 R120 R171 R161 R193 R173R175 R176 SH101 1 16 8 9U101 C101 C102 C104 C103 C106C107C188 CR101 CR102 L101 L102 L104 L105SH100 C308C301 C302C305 C303 C304 CR301CR302 L301 L302 R301 R302 SH301 C140 C141L116PB505 C511 C512 C513 C514 C520CR503 2 34 Q505 Q502 R505 R502 R501 VR443C505C502 R506R507 VR501 PB504 VR444 C350 C362 C351 C364C352 C349C353 C354 C363 C384 C385 CR310 L325L332 Q320R322 R345R320 R321 R324 R355 R346 SH321 330-400MHz Main Board Top Side PCB No. 8404101G06
5D-18Circuit Board/Schematic Diagrams and Parts List ZMY0131019-O C539 C540 C541 C542 C543 C548 C525 C526 C527 C528 C529 C530 C531 C532 C533 C534 C535 C536 C537 C538 C544 C545 C546C547 C549 C550 C551 C552 C553C555 R509 R511R510 2 S502 3 54 4C8 C S501 2J101 4 3 21 J102 C108 CR103 CR160 Q 111 3 4R101 R170 P100C132 C173 C172 CR105H101 R133 R172 R130 R131 C311 C309 C315 C321 C395 C307 C310 C314C306C380 C312 C318 C316 C313C317 CR304 CR305 CR303 L340 L304 L306 L307 L303 L305 Q301 R306 R307R304 R303 R347 R305R328 R340SH302 C329 C336 C344 C360 C355 C361C382 L314 L331 R343R350 C337C345 C347 C348C334 C356C341 C342 C358 C359 R344 13 25 37 1 U301 C383C390 C346 C339 C340C343 C357 SH322 C327 C338C326 C330 L330 Q302 R315R311 R312 R313 1 2 3B501 C215 C277C279 C522 C278L505 R205 U248VR441 VR506 SH202 Y201 4 32 C208 CR203 C263 C264 C298 C202 C204 L261 R204 C201 C223 C231C219 C232 C234C293R201 R202 R231R232 R233 1325 37 1U201C265 C218 C206C207 R281 U210 34C296 C258 C259 U211 34 C503 CR306 CR501 F501 SH304 C123 E101 R329 VR439 C130 C138C151 C170 C126 C128 C150 C152 L112 R102 C105 C174 C133C135 C134R109 R132 R136 259 17 U102 1 C224 L251C255 C254 C252 C256 CR251 CR252R254 R252 R251 C371 C372 C373 C378 C241 C246 C281 C295C242 C250 C243 C244C245 CR241CR242 CR243 L241 L242 L281 Q310R330 R331 R332R110 R112 R 111 R241 R242 R244 R245R349 SH242 U241 1020 1 11 330-400MHz Main Board Bottom Side PCB No. 8404101G06