US 12,176,863 B2
Amplifier circuit with temperature compensation
Pierre Pascal Savary, Muret (FR); and Stephane Damien Thuriés, Saubens (FR)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, INC., Austin, TX (US)
Filed on Jun. 16, 2021, as Appl. No. 17/349,081.
Claims priority of application No. 20305716 (EP), filed on Jun. 26, 2020.
Prior Publication US 2021/0408971 A1, Dec. 30, 2021
Int. Cl. H03F 1/30 (2006.01); G01S 7/03 (2006.01); G01S 7/40 (2006.01); H03F 3/19 (2006.01)
CPC H03F 1/30 (2013.01) [G01S 7/03 (2013.01); G01S 7/40 (2013.01); H03F 3/19 (2013.01); H03F 2200/447 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier circuit comprising:
an amplifier having an amplifier input terminal and an amplifier output terminal;
a temperature dependent variable impedance unit comprising:
a first terminal, a second terminal and a variable impedance unit control terminal;
a transistor comprising a conduction channel and a transistor control terminal, wherein the transistor control terminal is coupled to the variable impedance unit control terminal;
a first resistor, wherein the first resistor is coupled in parallel with the conduction channel of the transistor;
a capacitor coupled in series with the conduction channel of the transistor between the conduction channel and one of: (i) the first terminal; and (ii) the second terminal; and
wherein:
the first terminal is coupled to one of: (a) the amplifier input terminal and (b) the amplifier output terminal;
the second terminal is for coupling to a reference node;
the variable impedance unit control terminal is configured to receive a control signal that is based on a measured temperature indicative of a temperature of the amplifier circuit and thereby provide a temperature dependent variable impedance for the amplifier circuit; and
a control signal supply unit, wherein the control signal supply unit is configured to:
measure the temperature indicative of a current temperature of the amplifier circuit; and
provide the control signal based on the measured temperature to the variable impedance unit control terminal;
wherein the control signal supply unit includes registers for storing values to calibrate the control signal supply unit to provide fine-tuning of the temperature dependence based on one or more temperature measurements.