Multi-function passive frequency mixer
First Claim
1. A frequency-mixing device comprising:
- a first input port for a local oscillator signal having a frequency adapted to mix an input signal of the frequency-mixing device to a desired frequency;
a second input port for the input signal to be frequency-mixed;
a first capacitance operationally coupled in series between the second input port and an output port of the frequency-mixing device;
a first switch operationally coupled between the first capacitance and a ground level;
a second switch operationally coupled in series to the first capacitance, anda second capacitance operationally coupled between the second switch and the ground level,wherein the first switch and the second switch are configured to close and open alternately in response to a change in the voltage level of the oscillator signal.
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Accused Products
Abstract
A frequency-mixing device performing voltage multiplying and low-pass filtering operations in addition to frequency mixing is provided. The three operations may be carried out with the same components by designing the frequency mixer appropriately. The frequency mixer comprises a first capacitance connected in series to the input of the frequency-mixing device, a first switch connected in parallel to the first capacitance, a second switch connected in series to the first capacitance, and a second capacitance connected in parallel to the second switching means. The switches are controlled by a local oscillator signal to close and open alternately according to a change in the voltage level of the first oscillator signal.
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Citations
27 Claims
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1. A frequency-mixing device comprising:
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a first input port for a local oscillator signal having a frequency adapted to mix an input signal of the frequency-mixing device to a desired frequency; a second input port for the input signal to be frequency-mixed; a first capacitance operationally coupled in series between the second input port and an output port of the frequency-mixing device; a first switch operationally coupled between the first capacitance and a ground level; a second switch operationally coupled in series to the first capacitance, and a second capacitance operationally coupled between the second switch and the ground level, wherein the first switch and the second switch are configured to close and open alternately in response to a change in the voltage level of the oscillator signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A frequency-mixing device comprising:
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a first input port for a local oscillator signal having a frequency adapted to mix an input signal of the frequency-mixing device to a desired frequency; a balanced input port for an input signal to be frequency-mixed, the balanced input port comprising a first input and a second input; a balanced output port for a frequency-mixed output signal, the balanced output port comprising a first output and a second output; a first capacitance operationally coupled in series between the first input of the balanced input port and the first output of the balanced output port; a second capacitance operationally coupled in series between the first input of the balanced input port and the first output of the balanced output port; a first switch operationally coupled between the first capacitance and the second capacitance; a second switch operationally coupled in series to the first capacitance; a third switch operationally coupled in series to the second capacitance, and a third capacitance operationally coupled between the second switch and the third switch, wherein the first switch is configured to close and open alternately with the second switch and the third switch in response to a change in the voltage level of the oscillator signal.
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13. A frequency-mixing method in a frequency-mixing device, the method comprising:
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producing an oscillator signal having a frequency adapted to mix an input signal of the frequency-mixing device to a desired frequency; charging a first capacitance connected in series to an input port of the frequency-mixing device with an input signal sample during the first half cycle of the oscillator signal; and charging a second capacitance operationally coupled to the first capacitance with the charge in the first capacitance together with the input signal during the second half cycle of the oscillator signal. - View Dependent Claims (14, 15, 16, 17)
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18. A radio transceiver comprising a local oscillator and a frequency-mixing device, wherein the local oscillator is configured to produce a local oscillator signal to be input to the frequency-mixing device or to produce a signal to be used in forming the local oscillator signal, the frequency-mixing device comprising:
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a first input port for the local oscillator signal having a frequency adapted to mix an input signal of the frequency mixing device to a desired frequency; a second input port for the input signal to be frequency-mixed; a first capacitance operationally coupled in series between the second input port and an output port of the frequency mixing device; a first switch operationally coupled between the first capacitance and a ground level; a second switch operationally coupled in series to the first capacitance, and a second capacitance operationally coupled between the second switch and the ground level, wherein the first switch and the second switch are configured to close and open alternately in response to a change in the voltage level of the oscillator signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A frequency-mixing device comprising:
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a local oscillator providing a local oscillator signal having a frequency adapted to mix an input signal of the frequency-mixing device to a desired frequency; a first capacitance operationally coupled in series between an input port and an output port of the frequency-mixing device; a first switch operationally coupled between the first capacitance and a ground level; a second switch operationally coupled in series to the first capacitance, and a second capacitance operationally coupled between the second switch and the ground level, wherein the first switch and the second switch are configured to close and open alternately in response to a change in the voltage level of the oscillator signal.
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27. A frequency-mixing device comprising:
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means for obtaining an oscillator signal having a frequency adapted to mix an input signal of the frequency-mixing device to a desired frequency; means for charging a first capacitance connected in series to an input port of the frequency-mixing device with an input signal sample during the first half cycle of the oscillator signal, and means for charging a second capacitance operationally coupled to the first capacitance with the charge in the first capacitance together with the input signal during the second half cycle of the oscillator signal.
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Specification