Bypassing amplification

• US 8,063,698 B2
• Filed: 05/02/2008
• Issued: 11/22/2011
• Est. Priority Date: 05/02/2008
• Status: Active Grant

• Current Assignee: Bose Corporation
• Original Assignee: Bose Corporation
• Inventors: Howard, Damian
• Primary Examiner(s): NGUYEN, PATRICIA T
• Application Number:
  US12/114,256
• Publication Number:
  US 20090273387A1
• Time in Patent Office: 1,299 Days
• Field of Search: 330/51, 330/307, 381/59, 455/226.1
• US Class Current: 330/51
• CPC Class Codes: H03F 2200/03 the amplifier being designed for audio applications
• CPC Class Codes: H03F 2203/7221 the gated amplifier being switched on or off by a switch at the output of the amplifier
• CPC Class Codes: H03F 3/187 in integrated circuits
• CPC Class Codes: H03F 3/72 Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal

Abstract

An integrated circuit includes a power amplification circuit and a switch circuit wherein the switch circuit is coupled to an output of the power amplification circuit, a bypass input, and a control input, such that the switch selectively couples the power amplification circuit output or the bypass input to an output of the integrated circuit.

Claims

1. An integrated circuit comprising

a power amplification circuit;

a first switch circuit coupled to an output of the power amplification circuit, a bypass input, and a control input, such that the switch selectively couples the power amplification circuit output or the bypass input to an output of the integrated circuit;

a current source coupled to the bypass input;

a calibration resistor; and

a second switch coupled to the current source, the calibration resistor, and a second control input such that the second switch selectively couples the current source to the calibration resistor.