Amplifier
Amplifier
A class AB amplifier having an output stage comprising complementary common source transistors (T1, T2) has means for setting the quiescent current. These comprise a bias resistor (R1) through which a bias current is passed and which is connected between the gates of transistors (T1 and T2) to set their voltages. The current through the bias resistor (R1) is derived from two reference transistors (T3 and T4) which each have the desired quiescent current passed through them by current sources (3, 5). The gate voltages of the reference transistors (T3, T4) are applied across a reference resistor (R2) and the current through the reference resistor (R2) is mirrored (T5 to T9) to the bias resistor (R1).
US Patent 6384684
7 May 2002
Redman-White, William
d5376167-c925-460f-8e9c-13bffda8e0bf
Redman-White, William
(Inventors)
(2002)
Amplifier.
US Patent 6384684.
Abstract
A class AB amplifier having an output stage comprising complementary common source transistors (T1, T2) has means for setting the quiescent current. These comprise a bias resistor (R1) through which a bias current is passed and which is connected between the gates of transistors (T1 and T2) to set their voltages. The current through the bias resistor (R1) is derived from two reference transistors (T3 and T4) which each have the desired quiescent current passed through them by current sources (3, 5). The gate voltages of the reference transistors (T3, T4) are applied across a reference resistor (R2) and the current through the reference resistor (R2) is mirrored (T5 to T9) to the bias resistor (R1).
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More information
Published date: 7 May 2002
Organisations:
Nanoelectronics and Nanotechnology
Identifiers
Local EPrints ID: 337758
URI: http://eprints.soton.ac.uk/id/eprint/337758
PURE UUID: fb089863-24af-437b-95f0-506c1874c7a6
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Date deposited: 02 May 2012 13:47
Last modified: 11 Dec 2021 00:15
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Contributors
Inventor:
William Redman-White
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