Operational amplifier-based square wave oscillator. Given Figure 11.58: (a) Calculate the oscillator

Operational amplifier-based square wave oscillator. Given
Figure 11.58:

(a) Calculate the oscillator frequency and its duty cycle
and

(b) Select components to obtain an oscillator operating
at 10 kHz.

White noise in operational amplifiers. An operational
amplifier is used in an audio system to process audio signals with a bandwidth
of 20 kHz. The open-loop input resistance of the amplifier is 800 kW and its
open-loop gain equals 200,000. The amplifier is used in two modes: one as an
inverting amplifier and one as a non-inverting amplifier, both with a gain of
200. Assume that the input to the amplifier behaves as a resistor.

(a) Calculate the white noise level at the output of the
inverting amplifier at ambient temperature (30 C) if nothing is connected to
the input. The feedback resistor (Rf in Figure 11.6 (a)) is 200 kW and Ri is 1
kW. (b) Calculate the white noise level at the output of the non-inverting
amplifier at ambient temperature (30 C) if nothing is connected to the input.
The feedback resistor (Rf in Figure 11.6(b)) is 199 kW and Ri is 1 kW.

 

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