In case of class A amplifiers, the ratio (efficiency of transformer coupled amplifier)/(efficiency of a transformer less amplifier ) is

In Fig. if the CMRR of the operational amplifier is 60dB, then the magnitude of the output voltage is

(a) Specify the type of the negative feedback in the JFET amplifier shown in Fig.
(b)Calculate the voltage gain (V₀/V_i), of the amplifier with no feedback (R_f=$$\infty $$).
(c)Determine the value of the resistance R_f, required to give a voltage gain (V₀/V_i), or - 10.

Companding in PCM systems leads to improved signal - to - quantization noise ratio. This improvement is for