SWITCH WITH IMPROVED BIASING
First Claim
1. An apparatus comprising:
- a plurality of transistors coupled in a stacked configuration and to receive an input signal and provide an output signal;
a plurality of resistors coupled to gates of the plurality of transistors; and
an additional resistor coupled to the plurality of resistors and to receive a control signal for the plurality of transistors.
1 Assignment
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Accused Products
Abstract
Switches with improved biasing and having better isolation and reliability are described. In an exemplary design, a switch is implemented with a set of transistors, a set of resistors, and an additional resistor. The set of transistors is coupled in a stacked configuration, receives an input signal, and provides an output signal. The set of resistors is coupled to the gates of the set of transistors. The additional resistor is coupled to the set of resistors and receives a control signal for the set of transistors. The resistors reduce signal loss through parasitic capacitances of the transistors when they are turned on. The resistors also help split the signal swing of the input signal approximately evenly across the transistors when they are turned off, which may improve reliability of the transistors. The switch may be used in a switchplexer, a power amplifier (PA) module, etc.
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Citations
22 Claims
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1. An apparatus comprising:
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a plurality of transistors coupled in a stacked configuration and to receive an input signal and provide an output signal; a plurality of resistors coupled to gates of the plurality of transistors; and an additional resistor coupled to the plurality of resistors and to receive a control signal for the plurality of transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An integrated circuit comprising:
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a plurality of metal oxide semiconductor (MOS) transistors coupled in a stacked configuration and to receive an input radio frequency (RF) signal and provide an output RF signal; a plurality of resistors coupled to gates of the plurality of MOS transistors; and an additional resistor coupled to the plurality of resistors and to receive a control signal for the plurality of MOS transistors. - View Dependent Claims (14)
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15. An apparatus comprising:
a module comprising multiple switches to implement multiple signal paths, the module receives a radio frequency (RF) signal and routes the RF signal via one of the multiple signal paths, each of the multiple switches comprising a plurality of transistors coupled in a stacked configuration, a plurality of resistors coupled to gates of the plurality of transistors, and an additional resistor coupled to the plurality of resistors and to receive a control signal for the plurality of transistors. - View Dependent Claims (16, 17, 18)
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19. A method of performing signal switching, comprising:
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applying a control signal via a first resistor and further via a plurality of resistors to gates of a plurality of transistors coupled in a stacked configuration; passing an input signal through the plurality of transistors when turned on by the control signal; and blocking the input signal from passing through the plurality of transistors when turned off by the control signal. - View Dependent Claims (20, 21)
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22. An apparatus comprising:
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means for passing an input signal when turned on by a control signal and for blocking the input signal when turned off by the control signal; and means for applying the control signal via a first resistor and further via a plurality of resistors to the mean for passing and blocking the input signal.
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Specification