Multiple-tail transconductance switchable gain amplifer

Details Multiple-tail transconductance switchable gain amplifer Multiple-tail transconductance switchable gain amplifer

1997-12-12

1999-11-02

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330278, 330395, H03F 345

Patent

active

059778288

ABSTRACT:
This invention relates to variable gain amplifiers. The general technique described consists of adding gain elements in parallel in order to create multiple-gain amplifier stages versus the usual dual-gain amplifier stages separated from one another by DC level shift modules. The gain elements are enabled or disabled individually in combinations, which provide a range of controlled gain steps. The main advantages are that current consumption and design complexity are greatly reduced, thereby increasing operating battery life of the device using this type of amplifier.

REFERENCES:
patent: 4460872 (1984-07-01), Mattison
patent: 5216384 (1993-06-01), Vanhecke
patent: 5313172 (1994-05-01), Vagher
patent: 5420538 (1995-05-01), Brown
patent: 5461342 (1995-10-01), Crabtree
patent: 5619169 (1997-04-01), Matsuura
RF-Heterodyne Receiver Design Technique for Digital Cellular Wireless Systems, Josef Fenk, Siemens, 1995, pp. 1-85.

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