differential_amplifiers-1p - Differential Amplifiers...

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Differential Amplifiers
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Differential Amplifier Circuit Differential amplifier circuits have 2 inputs and 2 outputs. It can be operated with a dual power supply: V CC to V EE ; or with a single supply: V CC to G ND
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Features of Differential Amplifiers • It amplifies the difference between the 2 inputs • It is a high gain, low noise amplifier
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3 Modes of Operation 1. Single-ended an input signal is applied to one of the inputs and the other input is grounded. 2. Double-ended two opposite polarity input signals are applied to its inputs. 3. Common-mode the same input signal is applied to both inputs.
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DC Bias Both inputs are grounded: assuming both transistors are well matched: 0.7V V 0V V BE E E EE E EE E E R 0.7 V R ) V ( V I 2 I I I I E 2 C 1 C C C C CC 2 C 1 C C R I V V V V   EE E C C CC 2 CEQ 1 CEQ CE V R 2 R I V V V V
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Separate signals are applied to the inputs: V i1 and V i2 Separate signals are available at the outputs: V o1 and V o2       2 b 1 b fe E ie fe E fe E fe E ie 2 i 1 i i i h 1 R h h 1 R h 1 R h 1 R h v v         2 i 1 i fe E ie fe E fe E fe E ie ie fe E ie 2 b 1 b v v h 1 R h h 1 R h 1 R h 1 R h h h 1 R 2 h 1 i i 1 b C fe 1 C C 1 o i R h i R v 2 b C fe
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This note was uploaded on 05/25/2011 for the course ELECTRONIC 311 taught by Professor Umutsezen during the Fall '11 term at Hacettepe Üniversitesi.

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differential_amplifiers-1p - Differential Amplifiers...

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