Amplifying device and converter thereof

Details Amplifying device and converter thereof Amplifying device and converter thereof

2007-06-12

2007-06-12

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000

Reexamination Certificate

active

11222375

ABSTRACT:
A converter for an amplifying device having a first amplifier and a second amplifier is provided. The first amplifier and the second amplifier have a first tail current and a second tail current respectively. The converter includes a first compensating device and a second compensating device. The first compensating device is connected to the first amplifier, and under the control of the first tail current, determines whether to convert the first tail current to the second amplifier. The second compensating device is connected to the second amplifier, and under the control of the second tail current, determines whether to convert the second tail current to the first amplifier. There are two current paths between the first compensating device and the second compensating device and the converter can maintain the transconductance of the amplifying device at a substantially constant value.

REFERENCES:
patent: 4728900 (1988-03-01), Nakagawara et al.
patent: 5907259 (1999-05-01), Yamada et al.
patent: 6566951 (2003-05-01), Merrigan et al.
patent: 6919767 (2005-07-01), Mechnig et al.

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