Method and apparatus for duty-cycle correction with reduced current consumption
View Patent ↗A method and apparatus for duty-cycle correction with reduced current consumption have been described.
1. A method for duty cycle correction comprising:
receiving an output signal;
phase splitting said output signal producing phase split signals;
applying said phase split signals to a resistor-capacitor network; and
using two outputs from said resistor-capacitor network to duty cycle correct said output signal.
2. The method of claim 1 wherein said resistor-capacitor network further comprises a first transmission gate and a second transmission gate.
3. The method of claim 2 wherein said first transmission gate has an input coupled to said resistor-capacitor network and an output coupled to a correction circuit input.
4. The method of claim 3 wherein said second transmission gate has an input coupled to reference voltage and an output coupled to said correction circuit input.
5. The method of claim 4 wherein said second transmission gate when activated sets said correction circuit input to said reference voltage.
6. The method of claim 5 further comprising a switch which when activated sets said two outputs from said resistor-capacitor network to a same voltage.
7. An apparatus comprising:
a duty cycle correction circuit having an output, a first duty cycle correction input, and a second duty cycle correction input;
a phase splitter having an input, a first output, and a second output, said phase splitter input coupled to said duty cycle correction circuit output;
a first resistor-capacitor network having an input and an output, said first resistor-capacitor network input coupled to said phase splitter first output; and
a second resistor-capacitor network having an input and an output, said second resistor-capacitor network input coupled to said phase splitter second output.
8. The apparatus of claim 7 further comprising:
a first transmission gate having an input and an output, said first transmission gate input coupled to said first resistor-capacitor network output; and
a second transmission gate having an input and an output, said second transmission gate input coupled to said second resistor-capacitor network output.
9. The apparatus of claim 8 further comprising:
a switch between said first transmission gate output and said second transmission gate output.
10. The apparatus of claim 9 further comprising:
wherein said first transmission gate output is coupled to said first duty cycle correction input.
11. The apparatus of claim 10 further comprising:
wherein said second transmission gate output is coupled to said second duty cycle correction input.
12. The apparatus of claim 11 further comprising:
a third transmission gate having an input and an output, said third transmission gate output coupled to said first transmission gate output; and
a fourth transmission gate having an input and an output, said fourth transmission gate output coupled to said second transmission gate output.
13. The apparatus of claim 12 further comprising:
wherein said third transmission gate input and said fourth transmission gate input are coupled to a reference voltage.
14. A method comprising;
phase splitting a signal to be duty cycle corrected thereby producing a plurality of outputs;
averaging each of said plurality of outputs;
using said averaged each plurality of outputs to duty cycle correct said signal; and setting said plurality of outputs to a reference voltage before beginning said averaging said plurality of outputs.