Assume R1 = 2.7 kOhm and R2 = 9.7 kOhm. If Vo = 5 V, then Vi = ..... V.

Assume all resistors are 1 kOhm, v1 = 4.7, v3 = 9.7 V and v2 = v4 = 0 V. The output voltage is equal to ..... V.

For the shown amplifier, if R1 = 6.9 kOhm and R2 = 19.3 kOhm, then the gain is equal to .....

Note: Write the gain with its sign.

For the shown oscillator, if R1 = 6.9 kOhm, then R2 must be larger than ..... kOhm for the oscillation to start.

For a 2nd order LC LPF, if fo = 7.7 MHz and C = 1.2 nF, then R must be larger than ..... Ohm to avoid peaking in the frequency response.

For a Wien bridge oscillator, if fo = 9.1 kHz and C = 6.9 nF, then R = ..... kOhm.

For a passive RC LPF with cutoff frequency = fo, the magnitude response at f = 9.1*fo is equal to .... dB.

For the shown active LPF, if the gain at the cutoff frequency is equal to 17 dB and R1 = 2.2 kOhm, then R2 = ..... kOhm.

The number of biquad sections required to implement a 9th order LPF is equal to .....