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TANGEDCO AE EC 2015 Official Paper

Option 2 : 100 kHz

CT 1: Determinants and Matrices

2903

10 Questions
10 Marks
12 Mins

**Concept:**

The gain of a typical op-amp is inversely proportional to frequency. An op-amp is characterized by its gain-bandwidth product.

For example, an op-amp with a gain-bandwidth product of 1 MHz would have a gain of 5 at 200 kHz, and a gain of 1 at 1 MHz. This low-pass characteristic is introduced deliberately because it tends to stabilize the circuit by introducing a dominant pole. This is known as frequency compensation.

**Calculation:**

Non-inverting amplifier voltage gain = 20 dB

20 dB = \(20~log_{10}({A_v})\)

A_{v} = 10

gain × bandwidth = 1 MHz

∴ Bandwidth = \(\frac{1~MHz}{10}\)

Bandwidth** = 100 kHz**

**Note: **We generally calculate 3 dB bandwidth, and in this question also general formula has been used.