Frequency synthesizer
AssigneeInternational Telephone and Telegraph Corporation
InventorPeter D. Steensma
Life of this patent
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Abstract
The frequency synthesizer to generate a selected, adjustable discrete frequency output signal comprises a pair of acoustic means, a circuit to excite one of the pair of acoustic means with pulses having a given repetition frequency and to excite the other of the pair of acoustic means by the pulses after being delayed a given variable amount, and a frequency mixer coupled to each of the pair of acoustic menas to provide the selected discrete frequency output signal. Several embodiments of the acoustic means are disclosed.
Claims23
A frequency synthesizer to generate a selected, adjustable discrete frequency output signal comprising:
- a pair of acoustic means each providing an output signal having a predetermined frequency versus time characteristic;
- first means coupled to each of said pair of acoustic means to excite one of said pair of acoustic means with pulses having a given repetition frequency and to excite the other of said pair of means by said pulses after being delayed a given variable amount;
- and
- second means coupled to each of said pair of acoustic means to provide said selected discrete frequency output signal;
- each of said pair of acoustic means including
- a surface acoustic wave interdigital transducer having a predetermined spatially varying periodicity therealong;
- and
- said first means including
- a source of timing pulses having a repetition frequency greater than said given repetition frequency,
- a programmable frequency divider to provide said variable delay having its output coupled to said other of said pair of transducers,
- a fixed frequency divider having its input coupled to said source of timing pulses to provide said pulses on its output which is coupled to said one of said pair of transducers, and
- a gate means having an output coupled to an input of said programmable divider, a first input coupled to said source of timing pulses, a second input coupled to said output of said fixed divider to activate said gate means to pass said timing pulses to said programmable divider and a third input coupled to said output of said programmable divider to block passage of said timing pulse when a pulse appears at said output of said programmable divider.
A frequency synthesizer to generate a selected, adjustable discrete frequency output signal comprising:
- a pair of acoustic means each providing an output signal having a predetermined frequency versus time characteristic;
- first means coupled to each of said pair of acoustic means to excite one of said pair of acoustic means with pulses having a given repetition frequency and to excite the other of said pair of means by said pulses after being delayed a given variable amount;
- and
- second means coupled to each of said pair of acoustic means to provide said selected discrete frequency output signal;
- said first means including
- a source of timing pulses having a repetition frequency greater than said given repetition frequency,
- a programmable frequency divider to provide said variable delay having its output coupled to said other of said pair of transducers,
- a fixed frequency divider having its input coupled to said source of timing pulses to provide said pulses on its output which is coupled to said one of said pair of transducers, and
- a gate means having an output coupled to an input of said programmable divider, a first input coupled to said source of timing pulses, a second input coupled to said output of said fixed divider to activate said gate means to pass said timing pulses to said programmable divider and a third input coupled to said output of said programmable divider to block passage of said timing pulse when a pulse appears at said output of said programmable divider.
Dependencies are inferred from the claim text.