Design a voltage controlled oscillator based on the circuit of Fig 10 21a The center frequency is to be 10 kHz, C 0 01 micro F, and V CC 5 V For the transistors Icirc sup2 100 and I S 10 16 A The frequency is to be varied by 2 1 by an input V in 200 mV Specify all resistors and the dc value of V in...

280 A 0763 V I 1 305 A at center for 21 variati ...

Design a voltage-controlled oscillator based on the circuit of Fig. 10.21a. The center frequency is to be

Question:

Design a voltage-controlled oscillator based on the circuit of Fig. 10.21a. The center frequency is to be 10 kHz, C = 0.01µF, and V_CC= 5 V. For the transistors Î² = 100 and I_S= 10^ˆ’16A. The frequency is to be varied by 2:1 by an input ˆ† V_in= 200 mV. Specify all resistors and the dc value of V_in. Use SPICE to check your design and also to produce a plot of the transfer characteristic from V_into frequency.

Figure 10.21 a:

Vcc Q6 Q5 Q4 Q3 Vout Q2 Q1 IB IB |14 [4 Vin