Motorola Gp328 Gp338 Detailed 6804110j64 F Manual
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Frequency Generation Circuitry6A-95.0 Frequency Generation CircuitryThe 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 6-3: Frequency Generation Unit Block DiagramVol tag e MultiplierSynthesizer U201Dual Tran- sistorLoop FilterVCOBIC U241Low Pass FilterMatching NetworkAttenuatorTo Mixer To PA DriverVCPVmult1Aux3 Aux4 MOD Out Modulating Signal Vmult2Rx VCO Circuit Tx VCO CircuitTRB 16.8 MHz Ref. Osc.Rx Out Tx Out
6A-10Frequency Generation Circuitry5.1 Synthesizer(Refer toUHF Synthesizer Schematic Diagramon page 6A-20) 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 6-4Synthesizer Block DiagramDATA CLK CEX MODIN VCC,DC5V XTAL1 XTAL2 WARP PREIN VCPREFERENCE OSCILLATORVOLTAGE MULTIPLIERVOLTAGE CONTROLLED OSCILLATOR2-POLE LOOP FILTERDATA (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 BIAS241DUAL TRANSISDUAL TRANSIS-485VR5 5, 20, 34, 36 (U248 PIN 5) AUX1 VDD,3.3VMODOUT U251 LOW VOLTAGE FRACTIONAL-N SYNTHESIZERTORSTORS
Frequency Generation Circuitry6A-115.2 VCO - Voltage Controlled Oscillator(Refer toUHF Voltage Controlled Oscillator Schematic Diagramon page 6A-21) Figure 6-5VCO 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 20TX/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 Pin6RX TX(U201 Pin28)Rx-SW Tx-SW Vcc-Logic (U201 Pin28) Ste er Line Volta ge (VCTRL)Pin13 Pin3TRB_IN LO RF INJECTIONVSFVSF VSF
6A-12Frequency Generation CircuitryThe 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 6-1. 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 toUHF Receiver Front End Schematic Diagramon page 6A-18). 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 6-1: Level Shifter LogicDesired ModeAUX 4 AUX 3 TRBTxLowHigh (@3.2V)High (@4.8V) Rx High Low LowBattery SaverLowLowHi-Z/Float (@2.5V)
Notes For All Schematics and Circuit Boards 6A-136.0 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 SEQUENCELAYER 1 (L1) LAYER 2 (L2) LAYER 3 (L3) LAYER 4 (L4) LAYER 5 (L5) LAYER 6 (L6)INNER LAYERS SIDE 1 SIDE 2
Circuit Board/Schematic Diagrams and Parts List 6A -15 7.0 Circuit Board/Schematic Diagrams and Parts List L400R421 TP405 VR434 VR450 CR413Q417 3 4 TP406 J403 20 22C441 C491 C492C490 C493 C494 C495 C496C497 R477 R450 21 1C471 C472 C473 L401 TP410 VR447 VR449 C443 40 R435 TP401 TP402C427 C444C428 RT400 85 4 1U407 J400 C423 E407 E408 E409 R418R437R410 SH400 821 U405 1 7 22 C426 C425 C429 C424 R408 R492R429 R478 R428 1 16 U406 17 32PB503 3 FL201 B503 C432 SH201TP201 C220 C229 C217 C228 L201 L203 C260 C294 C235 C291 L202 U247 C203 Q210 3 4 R256R255 C210C211 C212 C213 C214 C230C292 C233 C238 C297 L232 Q260 3 4 C257 CR201 C251 C289 C253Q261 3 4 R260 SH241 C247 C285 C248 C286 L282 Q241 R243R248 R253 C273 3 L243 C370 C276C271 C272 L273 3 L253L271 C374C386 L321 R333 R339 C122C125C165 C161 C129 C169 L114L115 L113R161 9 16 C109 C110 C114 C166 C 111 C112 C113 C131L106 L10732 Q110 C119 C171 L108 R103R104 R120 R171 R173 U101 8 1 C118 C121 C160C115 C117C116 C120C127 L109 L160 R106 R107 R108 SH101 TP202 TP302 C375 C320C319 L309 R348T302 3 4 6 C381C322 L310 R309 R308 R310 SH303 T3013 46C324 C323 L311C325 FL301 R351 R352 SH323 B504 C397 PB504 R300 VR444C328 C391R326 R314 R316 R325 R334 R335 R338RT301 VR300 Q315 Q316 R318R319 R327 RT300 C331 C396 C333 CR308 R317 R336 R342 C104 C103 C106C107 CR102L102 L104 SH100 C101 C102 CR101L101 L105 C140 C141 L116 C520 PB505 VR443 C302 C301CR301 L301 C308 C303C304 C305 CR302 L302 R301R302 SH301C512 C384C385 C364 C351 C349 C350 C352C353 C354L325 Q320 R355 R322 R345R320 R324 R346 C362 C363CR310 L332 R321 SH321C521PB501 VR440 C505 C502 R507 VR501 Q505R506 C513 Q502 R505 C511 C514 CR503 2 34 R502R501 PB502 TP415 C401 C400 CR412 Q400 R401 R402 R403R405 R406 R407 R427R476U400 8 5C402 C467 C403 CR440 Q405 3 4 R416 R481 R446 4 C482 C480 Q403 R447 R448 SH401 UHF (403-470MHz) Main Board Top Side PCB No. 8480450Z03 http://www.myradio168.name
6A -16Circuit Board/Schematic Diagrams and Parts List C108 J101 4 3 2 J102 R1012 S501 C 8 C 4 CR303L303 SH302 C307 R340 R328 C309 R303R304 C315C321 C310 C314C306 C311 R347 R305 C313C318 C380 C316 C317C312 CR304 CR305 R306 R307C395 L340 L306 L307 L305 L304Q301 C337 C347 C348 C356C339 C340 C341 C342 C343 C383 C390 C346 C357C358 R344 C345 C334 C359 SH322 13 25 37 1U301 C329 C336 C360 C355C361 L314C344C382 L331 R343 R350 C327C330 C326 C338L330 Q302 R315R313R311 R312 C503 CR306 F501 SH304 C123 E101 R329 VR439 C130 C138C151 C170 C126 C128 C150 C152 L112 R102 C105 C174C133 C135 C134 CR105R109 R130 R131R132 25 9 17 U102 1 C295 C378 CR241 L281 L242 R110 R112 R 111 R349 C281C372C371 C373 Q310R330 R332R245 R331 C255 C252 C254CR251 L251 R251 R252R254 U241 10 201 11C241 C246 C242C243 C250C244C245 CR242 CR243 L241 R242 R241R244 SH242C224 C231C232 C234 R231 R232 R233 13 25 37 1U201 C296 C258 C259 U210 3 4 U211 3 4 C201 C223 C219 C293 L261 R202 R201 SH202 C264 C218C298 C202 C204 C206C207 C208 C263 C265CR203 R204 R281 C277 C279 C522 C278 L505 U248 VR441 VR506 C523 VR442 C436 C437 R420 R426 C431 C433 3FL401 R463 R414R415 C435 CR411 Q416R460 C434R462 R419 R461 U410 U409 76 1 C453 C456 L410 L411 R409 R411 R457 R432 C458 C459 C466 E400C449C463 E401E402E40326E404 E405 E406 SH402 51 C407 C479 R475R425R445 R449 C420 C419 C421C481 R413 SH403 C422 C416 C447C448 C475 R400 R423 R424 R431 R472 25 20 11 13 37 1U404 C408 C409 C411 C414 C451 C410 C430 C415 C440 C452 R436R434 C450 C476 Q410 3 4 R471 U420 10 1C445 VR432 VR433C442VR445 VR446 VR448R473 2 S502 35 4 B501 321 C132 C173 C172H101 P100 Q 111 3 4 R170 R133 R172CR501 UHF (403-470MHz) Main Board Bottom Side PCB No. 8480450Z03 http://www.myradio168.name
Circuit Board/Schematic Diagrams and Parts List 6A -17 DEMOD LVZIF_SEL RSSI 16.8MHzCLK DACRx DATA Vdda Vdda RX_IN RX_INJR5 RECEIVER DATA CLK DACRX DEMOD RSSI LVZIF_SEL 16.8MHz RX_INJSWB+ TX_INJ Vdda FGU 16.8MHz 4V_3.3V 5V CLK CSX DATA LOCK MODIN R5 CSX 4V_3.3VSWB+ LOCK MODIN 5V DATA RESET RX_IN TX_INJ UNSWB+ TRANSMITTER 5V CLK CSX 5V UNSWB+ RESETB503 B504 LI_ION C505 100pFR507 0 C502 0.47uF VR5016.8V1 5 HIGH32SWITCH S502 4 LOW Vdda VOLMECH_SWB+ 100pFC503VR506 6.8V 10V VR439L505 390nH 24V 2 1F501 2CR501 1BATT_CODE UNSWB+ BATT – BATT + RADIO_CODEBATTERY_CONTACT CONN_JB5012 DATA 1 NEG 3 POS PB501 1 2SWITCH .01uFC521 6.8V VR440 SB1 1 2PB502 SWITCH C522 .01uFVR441 6.8V PB503 SB2 C523 .01uF6.8V VR442 SWITCH PB504 1 21 2SWITCH VR444 6.8V PTT SB3 6.8V VR4431 2SWITCH PB505 .01uFC520 EMER 47K R506 Q505R505 10K Vdda GREEN_LED IMX1 5 1 6 24 3 SWB+ RED_LEDQ502 680 R501 180 R502 4 13 CR503 2 RTA0 RTA1 RTA2 RTA3 100pFC514 100pFC513 100pFC511 100pFC512SWITCH S501 GND GND1PC3 PC2 C0 C1 PC0 PC1 8 4 C0 C11 2 79 UHF Controls And Switches Schematic Diagram http://www.myradio168.name
6A -18Circuit Board/Schematic Diagrams and Parts List 100pF C386 Q310 13 2NU R331C372 R330 C371 NU NUNUNU 21R335 RT301 R338 C391 6.8K R325 R5 NUNU NU NU VR300 R326Q3161 3 2 R334NU NU NUNU33.0KRT300 2 1 1 3 2Q315 R319 150R318 18K R327 33K C333 R336 R5 NU NUR316 91K C396 NU C397 1uF2.2K R300 RSSI RX_INJ 100pFC3700 R339 R332 NU100pFC374 R333 0 R349 L321 C373 NU NU NUC378 NU 100pFC375 16.28nHL309 C320 C319 7.5pF 1.8pF2 T302 XFMR 4 63 1 C381 9.1pF TP302 3.6K R348 R5 7.5pFC318 9.1pFC317R329 0 CR305 CR304100K R307 R306 100K L306 13.9nHL307 13.9nH C316 3.9pF C313 10pF C31127nHL305 6.8pFC312 C306 NUNU R303 1KC310 0.1uF Q301 13 2 R340 6.8K2.7 R328C314 0.1uF 510 12KR305 C309 100pF R304 180nHL304 100pFC321100pFC315 R5 R342 100K C380 .01uF DACRx 2 XFMRT301 4 6 3 118 R309270 270R310 R308 CR306 3 4 IF 21 82pF C322 L310 150nH R317 1K 23 CR308 HSMP3820 1 100pFC331 C395 100pFL340 390nHR347 1K R5 C301 3.6pF RX_IN CR301 13.9nHL301 C302 10pFCR302 R302 100K R301 100K 3.9pFC303100pFC308 C305 20pF L302 13.9nHC304 9.1pFCR303 23 1 220nHL303C307 0.1uF SHIELDSH301 1 RXFE Top ShieldSH302 1 SHIELD 1 SH304 SHIELD RXFE Bottom Shield RX Mixer Diod ShieldSH303 SHIELD 1 Mixer Shield UHF Receiver Front End Schematic Diagram http://www.myradio168.name