Calvin Stephen Hao Chen

US Patent:

8358991, Jan 22, 2013

Filed:

Jan 26, 2010

Appl. No.:

12/693981

Inventors:

Xinyu Chen - Irvine CA, US
Calvin (Shr-Lung) Chen - Irvine CA, US
John Leete - Huntington Beach CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 1/06

US Classification:

4552321, 4552341, 455341, 330261, 330301

Abstract:

Embodiments of an RF receiver front-end are presented herein. In an embodiment, the RF receiver front-end comprises a transconductance LNA, a passive mixer, and a g-enhanced common-gate buffer. The transconductance LNA is configured to convert an RF voltage signal to an RF current signal and provide the RF current signal at an output. The passive mixer is coupled to the output of the transconductance LNA and is configured to mix the RF current signal with a local oscillator signal to produce a frequency translated current signal. The g-enhanced common-gate buffer is configured to receive the frequency translated current signal at an input and convert the frequency translated current signal to a frequency translated voltage signal. In an embodiment, the input of the gm-enhanced common-gate buffer is configured to provide a low input impedance to limit a voltage swing of the frequency translated current signal.

US Patent:

8421556, Apr 16, 2013

Filed:

Oct 16, 2009

Appl. No.:

12/580916

Inventors:

Calvin (Shr-Lung) Chen - Irvine CA, US
Ethan Chang - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03H 7/00
H01G 4/00

US Classification:

333174, 333175

Abstract:

A switched capacitor includes a capacitor and a switch. The capacitor is coupled between a p-node and an n-node and includes interleaved p-fingers and n-fingers. A number of the p-fingers is greater than a number of the n-fingers. The switch is coupled between the n-node and ground.

US Patent:

20110090017, Apr 21, 2011

Filed:

Jan 26, 2010

Appl. No.:

12/693993

Inventors:

Calvin (Shr-Lung) CHEN - Irvine CA, US
Morteza Vadipour - Woodland Hills CA, US
Xinyu Chen - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03B 5/12

US Classification:

331117FE

Abstract:

Embodiments of a multi-band voltage controlled oscillator (VCO) are provided herein. The multi-band VCO is configured to adjust a frequency of an output signal based on an input signal. The multi-band VCO includes a tank module, an active module, and a control module. The tank module includes a parallel combination of a capacitor and an inductor. The active module includes a pair of cross-coupled transistors that are configured to provide a negative conductance that cancels out a positive conductance associated with the tank module. To improve the phase noise associated with the multi-band VCO, the control module is configured to adjust the body voltage of the cross-coupled transistors.

US Patent:

20210256518, Aug 19, 2021

Filed:

May 4, 2021

Appl. No.:

17/307861

Inventors:

- San Francisco CA, US
Shalini Mayor - Foster City CA, US
Calvin Chen - Fremont CA, US

International Classification:

G06Q 20/40
G06Q 20/38

Abstract:

Embodiments are directed to the generation of a token associated with a status. The status of the token may affect how the token is treated and the types of restrictions placed on the token. The status of the token may indicate that the token is generated based on verification of secure user data. Alternatively, the status of the token may indicate that the token is generated based on insufficient user data and, as such, restrictions may be imposed on the token. The token requestor may be a mobile application, such as a merchant mobile application provisioned on a user device. In response to a token request from the merchant, the token provider issues tokens with varying status based on a confidence level. The status of the token may be indicated in terms of token assurance level.

US Patent:

20200232098, Jul 23, 2020

Filed:

Jan 21, 2020

Appl. No.:

16/748335

Inventors:

- Santa Clara CA, US
Sunity K. SHARMA - Fremont CA, US
Shinichi IKETANI - Sunnyvale CA, US
Calvin CHEN - Daly City CA, US
Shalaka RAHANGDALE - Morrisville NC, US

International Classification:

C23C 18/18
H05K 3/04
H05K 3/02
C23C 18/16

Abstract:

Methods of patterning electroless metals on a substrate are presented. The substrate is covered by a blocking reagent. After formation of a catalyst blocking layer on the substrate, portions of the catalyst blocking layer are removed to form a circuit pattern. A catalyst is placed the surfaces of both the catalyst blocking layer and the exposed substrate. The catalyst blocking layer prevents or reduces catalytic activity of the catalyst. Electroless metal plating is performed to plate a metal at the active portions of the catalyst.

US Patent:

20150356560, Dec 10, 2015

Filed:

Jun 5, 2015

Appl. No.:

14/732458

Inventors:

Vishwanath Shastry - Mountain View CA, US
Shalini Mayor - Foster City CA, US
Calvin Chen - Fremont CA, US

International Classification:

G06Q 20/40

Abstract:

Embodiments are directed to the generation of a token associated with a status. The status of the token may affect how the token is treated and the types of restrictions placed on the token. The status of the token may indicate that the token is generated based on verification of secure user data. Alternatively, the status of the token may indicate that the token is generated based on insufficient user data and, as such, restrictions may be imposed on the token. The token requestor may be a mobile application, such as a merchant mobile application provisioned on a user device. In response to a token request from the merchant, the token provider issues tokens with varying status based on a confidence level. The status of the token may be indicated in terms of token assurance level.