US 12,334,820 B2
Fast-switching current mirror
Gary Chunshien Wu, San Diego, CA (US)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Nov. 4, 2022, as Appl. No. 17/981,012.
Claims priority of provisional application 63/298,545, filed on Jan. 11, 2022.
Prior Publication US 2023/0223847 A1, Jul. 13, 2023
Int. Cl. H02M 1/08 (2006.01); H02M 3/156 (2006.01)
CPC H02M 3/156 (2013.01) [H02M 1/08 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A fast-switching current source, including:
a current mirror configured to be coupled to a first voltage and including first and second transistors configured to enable mirrored current flow through the first transistor when the current mirror is turned ON;
a third transistor configured to be controlled by an input signal and coupled to a control input of the current mirror, wherein the third transistor is configured to selectively enable and disable the current mirror according to the input signal;
a capacitor;
a fourth transistor including a conduction channel configured to be coupled to a second voltage and a control input configured to be controlled by the input signal, wherein the conduction channel of the fourth transistor is coupled to the capacitor;
a fifth transistor including a control input and a conduction channel coupled between the conduction channel of the second transistor and the conduction channel of the fourth transistor, wherein the control input of the fifth transistor is coupled to the capacitor,
wherein a first terminal of the capacitor is coupled to the control input of the fifth transistor, and
wherein a second terminal of the capacitor is coupled to the conduction channels of both the fifth and fourth transistors; and
a bias circuit configured to provide a reference voltage VREF to the control input of the fifth transistor.