US 11,855,598 B2
Variable gain amplifier including impedance ladder circuit with exponentially dependent degeneration resistance
Praveen Prabha, Lake Forest, CA (US); Karthik Raviprakash, San Jose, CA (US); Luke Wang, San Jose, CA (US); and Stephane Dallaire, Gatineau, CA (US)
Assigned to Marvell Asia Pte Ltd., Singapore (SG)
Filed by Marvell Asia Pte Ltd., Singapore (SG)
Filed on Aug. 25, 2022, as Appl. No. 17/895,771.
Application 17/895,771 is a continuation of application No. 17/210,080, filed on Mar. 23, 2021, granted, now 11,463,059.
Prior Publication US 2022/0407484 A1, Dec. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H03G 3/30 (2006.01); H03F 3/45 (2006.01); H03G 1/00 (2006.01); H03G 3/00 (2006.01)
CPC H03G 3/3036 (2013.01) [H03G 1/0088 (2013.01); H03G 3/001 (2013.01); H03F 3/45183 (2013.01); H03G 2201/502 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A variable gain amplifier comprising:
input terminals configured to receive a differential input of the variable gain amplifier;
output terminals configured to generate a differential output of the variable gain amplifier, the differential output being based on a gain applied by the variable gain amplifier to the differential input; and
an impedance ladder circuit connected to the input terminals, the impedance ladder circuit comprising a plurality of semiconductor switches configured to receive respective control signals based on a control voltage, the plurality of semiconductors switches configured to have an overall degeneration resistance that is exponentially dependent on the control voltage, and being responsive to the respective control signals to adjust the gain of the variable gain amplifier.