Patent ID: 9083289
Filing Date: 2015-07-14
Classification: H03F,H04B

Abstract:
1. A dual band amplifier comprising: a low pass filter circuit disposed in a first radio frequency (RF) path between an input port configured to receive an RF signal and a first amplifier including a first transistor and a second transistor configured as a source switch transistor, and a high pass filter circuit disposed in a second RF path between the input port and a second amplifier; a high band gate circuit connected to the first RF path at a control terminal of the first amplifier and configured to control a first bias voltage provided by control circuitry when the RF signal is in a first frequency range to enable the first amplifier, the source switch transistor configured to be enabled before the first amplifier to avoid oscillations; and a low band gate circuit connected to the second RF path and configured to control a second bias voltage provided by the control circuitry to a control terminal of the second amplifier when the RF signal is in a second frequency range to enable the second amplifier.