Apparatus for shifting the frequency of complex signals
DCFirst Claim
1. Apparatus for generating a phase shifted version of an input signal including in combination an offset signal generator means to provide a plurality of relatively phase shifted offset signals and a combination means responsive to said input signal and said plurality of offset signals to generate an output signal comprised of a combination of a plurality of portions of the input signal, each portion of which is responsive to one of said offset signals and said input signal such that each said portion of input signal is equivalent to a phase shifted portion of said input signal which portion is responsive to said offset signal, which output signal is the phase shifted version of said input signal.
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Abstract
The invention described herein provides an apparatus and method for accurately shifting the phase or frequency of a complex signal.
43 Citations
24 Claims
- 1. Apparatus for generating a phase shifted version of an input signal including in combination an offset signal generator means to provide a plurality of relatively phase shifted offset signals and a combination means responsive to said input signal and said plurality of offset signals to generate an output signal comprised of a combination of a plurality of portions of the input signal, each portion of which is responsive to one of said offset signals and said input signal such that each said portion of input signal is equivalent to a phase shifted portion of said input signal which portion is responsive to said offset signal, which output signal is the phase shifted version of said input signal.
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2. Apparatus for generating a phase shifted version of an input signal including in combination an offset signal generator means to provide a plurality of offset signals of differing relative phase and a combination means responsive to said input signal and said plurality of offset signals to generate an output signal comprised of a combination of a plurality of portion signals, each portion of which is responsive to one of said offset signals and said input signal such that each said portion signal is equivalent to a phase shifted input signal multiplied by said offset signal, which output signal is the phase shifted version of said input signal.
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3. Apparatus for generating a phase shifted version of an input signal including in combination an offset signal generator means coupled to receive an offset signal to provide a plurality of phase shifted versions of said offset signal and a combination means responsive to said input signal and said plurality of said phase shifted offset signals to generate an output signal comprised of a combination of a plurality of portions of the input signal, each portion of which is responsive to one of said phase shifted offset signals and said input signal such that each said portion signal is equivalent to a phase shifted portion of said input signal and wherein the quantity of said portion is responsive to one of said phase shifted offset signals, which output signal is the phase shifted version of said input signal.
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4. Apparatus for generating a phase shifted version of an input signal including in combination an offset signal generator means to provide a plurality of offset signals of differing relative phase, a fixed phase shift means to provide a phase shifted input signal, and a combination means responsive to said input signal and a first of said offset signals to generate a first portion signal and further responsive to said phase shifted input signal and a second offset signal to generate a second portion signal and to generate an output signal comprised of a combination of said of portion signals which output signal is the phase shifted version of said input signal.
- 13. Apparatus for producing a phase shifted version of an input signal including in combination an offset signal generator means responsive to a clocking signal to provide a plurality of offset signals of differing relative phase wherein the phase of each of said offset signals may be incremented with respect to a given phase in response to said clocking signal, and a plurality of portion generating means each of which is responsive to one of said offset signals and said input signal which may have been phase shifted by a fixed amount each of which portion generating means operates to output a portion signal having a frequency equivalent to the frequency of said input signal and an amplitude responsive to said one offset signal, and an adder means responsive to each of said portion signals to generate an output signal which output signal is said phase shifted version of said input signal.
- 16. Apparatus for producing a phase shifted version of an input signal including in combination an offset signal generator means responsive to a clocking signal to provide a plurality of offset signals in quadrature phase wherein the phase of said offset signals is incremented with respect to a given phase in response to said clocking signal, and where the direction of said increment is responsive to a direction signal, and a plurality of portion generating means each of which is responsive to one of said offset signals and said input signal each of which portion generating means operates to output a portion signal having a frequency equivalent to the frequency of said input signal and an amplitude responsive to said one offset signal and an adder means responsive to combine a plurality of said portion signals in quadrature to generate an output signal which is said phase shifted version of said input signal.
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21. Apparatus for producing a phase shifted version of an input signal including in combination an offset signal generator means responsive to a clocking signal to provide a plurality of offset signals in quadrature phase wherein the phase of said offset signals is changed with respect to a given phase in response to said clocking signal, and where the direction of said change is responsive to a direction signal, and a plurality of multiplier means each of which is responsive to one of said offset signals and said input signal to output a portion of said input signal which portion is responsive to said one offset signal and an adder means comprised of a 90°
- power combiner operative to combine a plurality of said portion signals in quadrature to produce an output signal which is said phase shifted version of said input signal.
- View Dependent Claims (22, 23, 24)
Specification