公开(公告)号：US20170187343A1

公开(公告)日：2017-06-29

申请号：US15460750

申请日：2017-03-16

Applicant: INPHI CORPORATION

Inventor： Ariel Leonardo VERA VILLARROEL ,  Subramaniam SHANKAR ,  Steffen O. NIELSEN

IPC: H03G3/30 ,  H03F3/45 ,  H03F3/19

CPC classification number: H03G3/3036 ,  H03F1/0205 ,  H03F1/083 ,  H03F3/19 ,  H03F3/211 ,  H03F3/4508 ,  H03F3/45085 ,  H03F2200/451 ,  H03F2200/91 ,  H03F2203/45458 ,  H03F2203/45496 ,  H03F2203/45644 ,  H03G1/0023 ,  H03G1/0082 ,  H03G5/28

Abstract: A variable gain amplifier having stabilized frequency response for widened gain control range. A resistor-capacitor compensation network is provided between two differential current input ports and corresponding emitter nodes of cross-coupled four transistors in the variable gain amplifier to desensitize the gain control voltages to the system noise and provide compensation to the VGA frequency response when the differential gain control voltage varies the gain setting, yielding a substantially stabilized frequency response over a −3 dB bandwidth ranging from 1 GHz to 60 GHz with a widened gain control range up to 12 dB without increasing power consumption.

公开(公告)号：US20170301971A1

公开(公告)日：2017-10-19

申请号：US15639013

申请日：2017-06-30

Applicant: INPHI CORPORATION

Inventor： Ariel Leonardo VERA VILLARROEL ,  Subramaniam SHANKAR ,  Steffen O. NIELSEN

IPC: H01P1/20 ,  H03H7/01

CPC classification number: H01P1/2007 ,  H03H7/0123 ,  H03H7/0153

Abstract: A circuit for blocking undesired input direct current of AC-coupled broadband circuits. The circuit includes a capacitor coupled to an input port and a common node. The input port receives a RF input signal. Additionally, the circuit includes a current source supplying a DC current to the common node leading a bias current to an output port. Further, the circuit includes a variable voltage source through an internal load and a close loop with an application circuit having an input load coupled to the output port to determine various bias voltages to control the bias current at the output port in association with a RF output signal that is substantially free of any input direct current originated from the RF input signal and is associated with an inherent low cut-off frequency independent of the various bias voltages.