US 12,407,298 B2
Frequency multiplier
Jun Seok Park, Seoul (KR); Nam Pyo Hong, Seoul (KR); and Kyu Hyun Nam, Seoul (KR)
Assigned to KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION, Seoul (KR)
Appl. No. 18/571,089
Filed by KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION, Seoul (KR)
PCT Filed Jun. 13, 2022, PCT No. PCT/KR2022/008268
§ 371(c)(1), (2) Date Dec. 15, 2023,
PCT Pub. No. WO2022/265315, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. 10-2021-0078621 (KR), filed on Jun. 17, 2021; application No. 10-2021-0140853 (KR), filed on Oct. 21, 2021; and application No. 10-2021-0140854 (KR), filed on Oct. 21, 2021.
Prior Publication US 2024/0291432 A1, Aug. 29, 2024
Int. Cl. H03B 5/12 (2006.01); H03B 5/04 (2006.01); H03B 19/10 (2006.01); H03B 19/14 (2006.01); H03L 7/099 (2006.01); H03L 7/24 (2006.01)
CPC H03B 5/1284 (2013.01) [H03B 5/04 (2013.01); H03B 5/1215 (2013.01); H03B 5/1228 (2013.01); H03B 5/1265 (2013.01); H03B 19/10 (2013.01); H03B 19/14 (2013.01); H03L 7/099 (2013.01); H03L 7/24 (2013.01); H03B 2200/0074 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A frequency multiplier comprising:
a harmonic generator,
wherein the harmonic generator includes:
a harmonic generating core unit;
a first resonant tank connected to a first output terminal and a second output terminal of the harmonic generating core unit; and
a first feedback circuit connected to the first output terminal and the second output terminal of the harmonic generating core unit to change effective resistance of the first resonant tank,
wherein the first feedback circuit includes an oscillation control loop configured to control an output voltage between the first output terminal and the second output terminal to converge to a predetermined reference voltage,
wherein the first feedback circuit is configured to generate an effect of adding negative parallel resistance to parasitic resistance of the first resonant tank,
wherein the first feedback circuit is configured to increase an effective resistance value of the resonant tank to be greater than a parasitic resistance value of the first resonant tank,
wherein the harmonic generating core unit includes:
a first transistor;
a second transistor;
a third transistor and a fourth transistor forming a first differential pair; and
a fifth transistor and a sixth transistor forming a second differential pair,
wherein the third transistor and the fifth transistor are connected to the first output terminal, and the fourth transistor and the sixth transistor are connected to the second output terminal,
wherein the first feedback circuit includes:
a seventh transistor; and
an eighth transistor and a ninth transistor that are connected to the seventh transistor and cross-coupled to each other, and
wherein the oscillation control loop includes a detector configured to measure a voltage between the first output terminal and the second output terminal, a non-inverting amplifier connected to the detector, and an operational amplifier connected to the non-inverting amplifier and of which an output terminal is connected to the seventh transistor.