US 11,815,530 B2
RF power detector with a variable threshold
Joerg Fuhrmann, Linz (AT); Werner Schelmbauer, Steyr (AT); Herbert Stockinger, Schliersee (DE); and Dieter Pimingsdorfer, Linz (AT)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 16/976,666
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Mar. 27, 2018, PCT No. PCT/US2018/024419
§ 371(c)(1), (2) Date Aug. 28, 2020,
PCT Pub. No. WO2019/190466, PCT Pub. Date Oct. 3, 2019.
Prior Publication US 2021/0003613 A1, Jan. 7, 2021
Int. Cl. G01R 15/09 (2006.01); H04B 17/10 (2015.01); G01R 21/01 (2006.01); H03F 3/19 (2006.01); H03K 5/24 (2006.01)
CPC G01R 15/09 (2013.01) [G01R 21/01 (2013.01); H03F 3/19 (2013.01); H03K 5/24 (2013.01); H04B 17/101 (2015.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency (RF) power detector, comprising:
a first transistor of a first conductivity type having a first electrode coupled to an output node, a control electrode for receiving an input RF signal and a direct current (DC) bias voltage, and a second electrode;
a second transistor of a second conductivity type opposite the first conductivity type having a first electrode coupled to the first electrode of the first transistor, a control electrode coupled to the first electrode of the second transistor, and a second electrode coupled to a supply voltage;
a third transistor of the first conductivity type having a first electrode coupled to the output node, a control electrode for receiving the DC bias voltage and an additional DC bias voltage, and a second electrode;
a fourth transistor of the second conductivity type having a first electrode coupled to the first electrode of the third transistor, a control electrode coupled to the first electrode of the fourth transistor, and a second electrode coupled to the supply voltage; and
a comparator for comparing an output signal on the output node to a reference signal.