Low power folding amplifier

Details Low power folding amplifier Low power folding amplifier

1999-06-30

2000-12-05

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 51, 330295, 330253, 330261, H03F 345

Patent

active

061572578

ABSTRACT:
A folding amplifier in which a single tail current is used to service all differentially coupled transistor pairs in the amplifier. The input signal applied to each differential pair of transistors is used to drive a switch which controls the tail current to that specific differential pair. When a differential pair is fully switched in either direction, the associated tail current switch is open. As the input signal applied to the differential pair causes the pair to pass through its active region, the switch associated with that pair closes to allow current to be conducted through that pair. Therefore, the tail current has a path which is primarily through a single differential pair at any given time.

REFERENCES:
patent: 5045804 (1991-09-01), Sugawara et al.

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