Back to results
US 5,105,108 AGranted
Delay circuit with phase locked loop control
AssigneeZenith Electronics Corporation
InventorDuc Ngo
Life of this patent
Estimating the term…
Abstract
A delay circuit includes an output voltage controllable BICMOS delay element that is coupled to a phase locked loop that develops a control voltage. The control voltage is applied to the output BICMOS delay element and to another BICMOS delay element in the phase locked loop. An input voltage is applied to the phase locked loop and, along with the output of the phase locked loop, to the output BICMOS delay element.
Claims5
A delay circuit comprising:
- first BICMOS delay means including voltage controllable time constant means;
- a source of input voltage coupled to said first BICMOS delay means;
- phase detector means, including a phase detector, a loop filter and an amplifier and level shifter, for receiving said input voltage and an output of said first BICMOS delay means and for producing a control voltage;
- means coupling said control voltage to said first BICMOS delay means for controlling said time constant means;
- and
- a second BICMOS delay means coupled to receive said input voltage and said control voltage.
3 more elements
A delay circuit comprising:
- first BICMOS delay means including first voltage controllable time constant means;
- a source of input voltage coupled to said BICMOS delay means;
- phase locked loop means for receiving said input voltage and an output of said first BICMOS delay means and for producing a control voltage, said phase locked loop means, including an exclusive OR gate phase detector, a loop filter and an amplifier and level shifter for developing said control voltage;
- a second BICMOS delay means including second voltage controllable time constant means coupled to receive said input voltage and said control voltage;
- and
- means coupling said control voltage to said first and to said second BICMOS delay means for controlling said first and said second voltage controllable time constant means.
3 more elements
Dependencies are inferred from the claim text.