US 11,881,828 B2
Tunable effective inductance for multi-gain LNA with inductive source degeneration
Jing Li, Austin, TX (US); Emre Ayranci, Costa Mesa, CA (US); and Miles Sanner, San Diego, CA (US)
Assigned to pSemi Corporation, San Diego, CA (US)
Filed by pSemi Corporation, San Diego, CA (US)
Filed on Feb. 14, 2022, as Appl. No. 17/671,374.
Application 17/671,374 is a continuation in part of application No. 17/503,710, filed on Oct. 18, 2021.
Application 17/503,710 is a continuation of application No. 16/860,739, filed on Apr. 28, 2020, granted, now 11,152,907, issued on Oct. 19, 2021.
Application 16/860,739 is a continuation of application No. 16/046,962, filed on Jul. 26, 2018, granted, now 10,673,401, issued on Jun. 2, 2020.
Application 16/046,962 is a continuation of application No. 15/479,173, filed on Apr. 4, 2017, granted, now 10,038,418, issued on Jul. 31, 2018.
Prior Publication US 2022/0231648 A1, Jul. 21, 2022
Int. Cl. H03F 1/32 (2006.01); H03F 1/22 (2006.01); H03F 3/193 (2006.01); H03F 3/21 (2006.01); H03G 3/30 (2006.01); H03F 3/72 (2006.01); H03G 1/00 (2006.01); H03G 3/00 (2006.01)
CPC H03G 3/3036 (2013.01) [H03F 1/223 (2013.01); H03F 1/3205 (2013.01); H03F 3/193 (2013.01); H03F 3/211 (2013.01); H03F 3/72 (2013.01); H03G 1/0023 (2013.01); H03G 1/0029 (2013.01); H03G 1/0088 (2013.01); H03G 3/001 (2013.01); H03F 2200/156 (2013.01); H03F 2200/159 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01); H03F 2200/489 (2013.01); H03F 2200/492 (2013.01); H03F 2200/61 (2013.01); H03F 2203/7239 (2013.01); H03G 3/3052 (2013.01); H03G 2201/504 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A multi-gain low noise amplifier (LNA), comprising:
a cascode arrangement comprising an input transistor and an output cascode transistor; and
a tunable degeneration network having a first terminal connected to a source of the input transistor and a second terminal connected to a reference ground, the tunable degeneration network comprising:
a fixed inductance inductor connected between the first terminal and the second terminal; and
a first switchable shunting network connected between the first terminal and the second terminal, the first switchable shunting network comprising:
a first switch in series connection with a first capacitor, wherein the first capacitor has a capacitance so that at a frequency band of operation of the multi-gain LNA, a parallel combination of the fixed inductance inductor and the first capacitor results in a first parallel combined inductive impedance that is larger than an inductive impedance of the fixed inductance inductor.