Patent ID: 6804502
Filing Date: 2004-10-12
Classification: H01P,H03K,H04B

Abstract:
An RF switch circuit for switching RF signals, comprising:(a) a first input port receiving a first RF input signal; (b) a second input port receiving a second RF input signal; (c) an RF common port; (d) a first switch transistor grouping having a first node coupled to the first input port and a second node coupled to the RF common port, wherein the first switch transistor grouping is controlled by a switch control signal (SW); (e) a second switch transistor grouping having a first node coupled to the second input port and a second node coupled to the RF common port, wherein the second switch transistor grouping is controlled by an inverse (SW_) of the switch control signal (SW); (f) a first shunt transistor grouping having a first node coupled to the second input port and a second node coupled to ground, wherein the first shunt transistor grouping is controlled by the switch control signal (SW); and (g) a second shunt transistor grouping having a first node coupled to the first input port and a second node coupled to ground, wherein the second shunt transistor grouping is controlled by the inverse (SW_) of the switch control signal (SW); wherein, when SW is enabled, the first switch and shunt transistor groupings are enabled while the second switch and shunt transistor groupings are disabled, thereby passing the first RF input signal through to the RF common port and shunting the second RF input signal to ground; and wherein when SW is disabled, the second switch and shunt transistor groupings are enabled while the first switch and shunt transistor groupings are disabled, thereby passing the second RF input signal through to the RF common port and shunting the first RF input signal to ground.