Matthew R Day

US Patent:

7940124, May 10, 2011

Filed:

Feb 23, 2009

Appl. No.:

12/391133

Inventors:

Mirza Kolakovic - Livonia MI, US
Greg Hamel - Livonia MI, US
Matthew Day - Commerce Township MI, US

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

H03F 3/04

US Classification:

330296, 330302, 330273

Abstract:

A Bi-Directional and Adjustable Current Source (“BACS”) for providing an amplifier input with a voltage signal that is linear, where an output of the BACS and the amplifier input are shunted with a capacitor, is described. The BACS may include a first switch in signal communication with a high voltage reference and a first current source in signal communication with the first switch. The BACS may also include a second switch in signal communication with a low voltage reference and a second current source in signal communication with the second switch. The BACS may further include a directional current element in signal communication with both the first current source, the second current source, the output of the BACS, the amplifier input, and the capacitor, where the directional current element is configured to prevent current flow from the output BACS to the first current source.

US Patent:

8384474, Feb 26, 2013

Filed:

May 10, 2011

Appl. No.:

13/104023

Inventors:

Mirza Kolakovic - Livonia MI, US
Greg Hamel - Livonia MI, US
Matthew Day - Commerce Township MI, US

Assignee:

Harmon International Industries, Incorporated - Stamford CT

International Classification:

H03F 1/14

US Classification:

330 51, 330302, 330296

Abstract:

A Bi-Directional and Adjustable Current Source (“BACS”) for providing an input voltage to a mute/standby control pin of a power stage integrated circuit (“IC”) of an amplifier input with a voltage signal that is linear, where an output of the BACS and the input to the control pin are shunted with a capacitor, is described. The BACS may include a first switch in signal communication with a high voltage reference and a first current source in signal communication with the first switch. The BACS may also include a second switch in signal communication with a low voltage reference and a second current source in signal communication with the second switch. The BACS may further include a directional current element in signal communication with both the first current source, the second current source, the output of the BACS, the input to the control pin, and the capacitor, where the directional current element is configured to prevent current flow from the output BACS to the first current source.