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Using Op-Amps for Radio Frequency Design

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Unformatted Attachment Preview

Using Op-Amps for Radio Frequency Design Q1.Calculate the value of RG needed in order to produce the following output voltages (peak-to-peak): a. Vout = 5 volts b. V out = 7.5 volts c. V out = 10 volts d. V out = 10.5 volts Ans V out = VRF +VINV V out=(IRF *RF ) +VINV We connect RG from inverting input to ground to get more voltage, now the current Through RF is sum of currents through ROSC and RG. IRG=VINV/RG IOSC=VOSC/ROSC So, IRF=IRG+IROSC Therefore we use this formula to find value of RG for given V out VOUT=RF*(VOSC/ROSC+VINV/RG)+VINV As, VRES=VINV=1Vp-p VOSC=0.5Vp-p ROSC=330? RF=1K? a) For V out =5v Using the above mentioned formula for V out 5=1000*((0.5/330)+(1/RG))+1 (5-1)/1000=(0.5/330)+(1/RG) (4x10-3)-(0.5/330)=1/RG RG=402.43? b) For V out=7.5v Using the above mentioned formula for V out 7.5=1000*((0.5/330)+(1/RG)) ...
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