LINEAR-IN-DB, LOW-VOLTAGE, PROGRAMMABLE/VARIABLE GAIN AMPLIFIER (PGA) USING RECURSIVE CURRENT DIVISION

WIPO Patent Application WO/2018/035880

A1

A Programmable-Gain Amplifier (PGA) has programming steps that are linear when expressed in Decibels (linear-in-dB). A Recursive Current Division (RCD) resistor network (30) generates currents that are selected by programmable switches (34, 44, 54) to connect to a summing node (VS) input of an amplifier (10). A feedback resistor (14) is connected across the summing node (VS) and the amplifier (10) output (VOUT). The resistor network (30) has only three resistance values regardless of the number of currents selectable as programming steps. The value of a third resistor (53) is set equal to the equivalent resistance of a second resistor (32, 42, 52) in parallel with a series connection of a first resistor (31, 41, 51) and the third resistor (53). Each final cell (50) in the resistor network (30) is equivalent to the third resistor (53), allowing recursive division of adjacent currents. The ratio of adjacent currents remains constant for all cells. Recursive Current Division (RCD) produces linear-in-dB programming steps. Floating switches are avoided since switches connect to ground.

JP3105489	AMPLIFIER AND SEMICONDUCTOR DEVICE
JPS5652919	GRAPHIC EQUALIZER
JPS5980009	GAIN CONTROLLER OF AMPLIFIER

CHAN CHI HONG (CN)
YAU BUN GO (CN)
CHUNG GORDON (CN)

PCT/CN2016/097397

March 01, 2018

August 30, 2016

Click for automatic bibliography generation  

HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)

H03G1/00; H03G3/30

US5455582A	1995-10-03
CN101783653A	2010-07-21
US6633246B1	2003-10-14
US4631522A	1986-12-23
US6307490B1	2001-10-23
US20070096965A1	2007-05-03
CN1734932A	2006-02-15

CHINA TRUER IP (CN)

View/Download PDF      PDF Help

Previous Patent: IMAGE PROCESSING METHOD AND DEVICE

Next Patent: BOTTLE CAP COMBINATION LOCK