Amplifier with bypass switch

Details Amplifier with bypass switch Amplifier with bypass switch

2011-03-01

2011-03-01

Pascal, Robert (Department: 2817)

Amplifiers

Combined with automatic amplifier disabling switch means

Reexamination Certificate

active

07898325

ABSTRACT:
An amplifying circuit of a receiver for receiving a signal in a wireless network includes an amplifier and a switch. The amplifier includes an amplifying transistor having a gate connected to an input for receiving the signal and a source/drain connected to a voltage source through an inductance. The amplifier also includes a bypass transistor having a gate connected to a control signal for activating the bypass transistor in a bypass mode and a source/drain connected in parallel with the inductance. The switch is connected in parallel with the amplifier between the input and an output, and activates in the bypass mode, enabling the received signal to bypass the amplifier. In the bypass mode, a voltage at the source/drain of the amplifying transistor is lower when the bypass transistor is activated than when not activated, the lower source/drain RF voltage reducing unwanted harmonics from the amplifier.

REFERENCES:
patent: 6838933 (2005-01-01), Goyette et al.
patent: 6864743 (2005-03-01), Pozdeev
patent: 6930546 (2005-08-01), Floyd
patent: 7388428 (2008-06-01), Wiegner et al.
patent: 2009/0015335 (2009-01-01), Floyd
patent: 2009/0096527 (2009-04-01), Ishiguro
patent: WO0215397 (2002-02-01), None
Avago Technologies, Inc., “MGA-72543: PHEMT* Low Noise Amplifier with Bypass Switch”, www.avagotech.com, May 23, 2008, pp. 1-21.
Avago Technologies, Inc., “MGA-645T6: Low Noise Amplifier iwth Bypass/shutdown Mode in Low Profile Package”, www.avagotech.com, Jan. 30, 2007, pp. 1-15.

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