Multi-input multi-frequency synthesizing apparatus and method for multi-band RF receiver
First Claim
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1. A frequency synthesizer comprising:
- a first multi-input double side band (DSB) mixer which synthesizes a first input signal and a second input signal, which are selected from a plurality of high frequency signals, and generates a first synthesized signal;
a second multi-input DSB mixer which synthesizes a Q signal of the first input signal and a Q signal of the second input signal, and generates a second synthesized signal; and
a single side band (SSB) signal selection unit which generates a third synthesized signal whose frequency is a synthesis of a frequency of the first input signal and a frequency of the second input signal, from the first synthesized signal and the second synthesized signal.
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Abstract
A multi-input multi-frequency synthesizing apparatus and method for a multi-band radio frequency (RF) receiver. The frequency synthesizing apparatus may generate an output from a greater number of high frequency signals by using one multi-input single side band (SSB) mixer. The multi-input SSB mixer may generate a signal whose frequency is an addition of frequencies of two signals selected from a signal selection control unit, or a difference of frequencies therebetween. According to a circuit configuration of the multi-input SSB mixer, the signal selection control unit may select more than two signals.
11 Citations
16 Claims
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1. A frequency synthesizer comprising:
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a first multi-input double side band (DSB) mixer which synthesizes a first input signal and a second input signal, which are selected from a plurality of high frequency signals, and generates a first synthesized signal;
a second multi-input DSB mixer which synthesizes a Q signal of the first input signal and a Q signal of the second input signal, and generates a second synthesized signal; and
a single side band (SSB) signal selection unit which generates a third synthesized signal whose frequency is a synthesis of a frequency of the first input signal and a frequency of the second input signal, from the first synthesized signal and the second synthesized signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A frequency synthesizer comprising:
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a signal selection control unit which selects and outputs a first signal and a Q signal of the first signal, and a second signal and a Q signal of the second signal, from a plurality of high frequency signals; and
a multi-input single side band (SSB) mixer which generates and outputs a signal, whose frequency is a synthesis of frequencies of the first signal and the second signal, from the first signal, the Q signal of the first signal, the second signal and the Q signal of the second signal, wherein the multi-input SSB mixer comprises DSB mixers containing transistors which receive the plurality of high frequency signals and Q signals of the plurality of high frequency signals, and the multi-input SSB mixer generates and outputs a corresponding frequency synthesized signal when signals selected by the signal selection control unit are changed. - View Dependent Claims (9, 10, 11)
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12. A frequency synthesizing method comprising:
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first synthesizing a first input signal and a second input signal selected from a plurality of high frequency signals, in a first DSB mixer;
second synthesizing a Q signal of the first input signal and a Q signal of the second input signal selected from Q signals of the plurality of high frequency signals, in a second DSB mixer; and
third synthesizing the first synthesized signal and the second synthesized signal. - View Dependent Claims (13, 14, 15, 16)
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Specification