Signal processing circuit for switch capable of reducing insertion loss
First Claim
1. A signal processing circuit for a switch comprising:
- a switch having a plurality of routes to pass a signal; and
a first controller, to select one of the routes, for supplying a positive voltage and a negative voltage as switch control signals to said switch in response to a control signal.
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Accused Products
Abstract
A high frequency power amplifier is implemented by a GaAs FET and is supplied with a positive and a negative power supply. The amplifier amplifies the power of an input signal and delivers the amplified signal to a high frequency switch. The high frequency switch is supplied switch control voltages in the form of the positive and negative voltages. Since the switch control voltages are implemented as the positive and negative voltages, a great difference in level between the switch control voltages is achievable which improves insertion loss. While the high frequency switch may also be implemented by GaAs FETs, the insertion loss will be further reduced if the negative voltage is applied to the high frequency switch only during transmission. In this case, current consumption will also be reduced if the generation of the negative voltage is controlled at the negative voltage source side.
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Citations
17 Claims
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1. A signal processing circuit for a switch comprising:
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a switch having a plurality of routes to pass a signal; and a first controller, to select one of the routes, for supplying a positive voltage and a negative voltage as switch control signals to said switch in response to a control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A signal processing circuit for a switch of a communication apparatus comprising:
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amplifying means for supplying amplified signals; switch having a plurality of routes to pass said amplified signals; positive voltage generating means for generating a positive voltage and supplying said positive voltage to said amplifying means and said switch; second voltage generating means for generating either a negative voltage or a zero voltage and supplying said voltage to said amplifying means and said switch; first control means, to select one of said routes of said switch, for selectively supplying said positive voltage and said negative voltage as switch control signals to said switch in response to a first control signal; and second control means for supplying said first control signal to said first control means. - View Dependent Claims (13)
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14. A method for controlling a signal processing circuit for a switch, the method comprising the steps of:
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(a) switching between a plurality of routes to pass a signal therethrough; and (b) selecting one of said routes by supplying a first normally positive voltage and a second voltage to said switch as switch control signals in response to a control signal. - View Dependent Claims (15)
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16. A method for controlling a signal processing circuit in a communication apparatus, the method comprising:
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(a) amplifying one or more input signals to generate one or more amplified input signals; (b) switching between a plurality of routes for passage of said amplified input signals; (c) selecting between said routes according to a switch control signal applied thereto, wherein a positive voltage is supplied to one or more of said routes while a second voltage is applied to the other of said routes. - View Dependent Claims (17)
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Specification