Patent ID: 7088190
Filing Date: 2006-08-08
Classification: H03K

Abstract:
1. An oscillator delay stage circuit operating between first and second operating voltages, wherein the first operating voltage is higher than the second operating voltage, the oscillator delay stage circuit comprising: (a) an inverting circuit including an input node and an output node, wherein the inverting circuit is configured to receive an input signal from the input node and generate an output signal to the output node, and wherein the inverting circuit is further configured to increase the output signal in voltage in response to the input signal decreasing in voltage and to decrease the output signal in voltage in response to the input signal increasing in voltage; and (b) a control circuit including (i) a first switch circuit and a first resistance adjusting circuit electrically coupled in series between the output node and the second operating voltage, and (ii) a second switch circuit and a second resistance adjusting circuit electrically coupled in series between the output node and the first operating voltage, wherein in response to the input signal increasing in voltage towards the first operating voltage, the first switch circuit is configured to decrease in resistance, wherein in response to the input signal decreasing in voltage towards the second operating voltage, the second switch circuit is configured to decrease in resistance, wherein the first resistance adjusting circuit is configured to receive as input an external control signal and to change in resistance in response to a change of the external control signal, wherein the second resistance adjusting circuit is configured to receive as input the external control signal and to change in resistance in response to a change of the external control signal, and