Method and system for frequency up-conversion with a variety of transmitter configurations
DC CAFCFirst Claim
1. An apparatus for frequency up-conversion comprising:
- pulse shaping means for shaping a string of pulses from a reference signal;
aperture generation means coupled to said pulse shaping means for generating a string of multiple pulses from said string of pulses; and
gating means for gating a bias signal under the control of said string of multiple pulses to generate a periodic signal having a plurality of harmonics at least one of which is at a desired frequency.
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Abstract
A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transmitter. The up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used as a frequency or phase reference, the oscillating signal is not modulated, and controls a switch that is connected to a bias signal. When the invention is being used in the frequency modulation (FM) or phase modulation (PM) implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate the bias signal. In the amplitude modulation implementation (AM), the oscillating signal is not modulated, but rather causes the switch to gate a reference signal that is substantially equal to or proportional to the information signal. In the FM and PM implementations, the signal that is output from the switch is modulated substantially the same as the modulated oscillating signal. In the AM implementation, the signal that is output from the switch has an amplitude that is a function of the information signal. In both embodiments, the output of the switch is filtered, and the desired harmonic is output.
651 Citations
20 Claims
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1. An apparatus for frequency up-conversion comprising:
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pulse shaping means for shaping a string of pulses from a reference signal;
aperture generation means coupled to said pulse shaping means for generating a string of multiple pulses from said string of pulses; and
gating means for gating a bias signal under the control of said string of multiple pulses to generate a periodic signal having a plurality of harmonics at least one of which is at a desired frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for frequency up conversion comprising:
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shaping a string of pulses from a reference signal;
generating a string of multiple pulses from said string of pulses; and
gating a bias signal under the control of said string of multiple pulses to generate a periodic signal having a plurality of harmonics at least one of which is at a desired frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification