Voltage Control Oscillator Without Being Affected by Variations of Process and Bias Source
AssigneeEtron Technology, Inc.
InventorsChun Shiah, Cheng-Nan Chang, Yu-Sheng Lai
Life of this patent
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Abstract
A VCO includes a reference current module and a clock signal generating module. The reference current module generates a reference current according to a reference voltage. The clock signal generating module generates a clock signal according to the reference current. The reference current module utilizes the negative feed-back mechanism to keep the generated reference current at the predetermined size without being changed with the variation of the process and the bias source.
Claims24
A Voltage Controlled Oscillator (VCO) without being affected by process or bias voltage source, the VCO generating a clock signal with a frequency corresponding to a reference voltage, the VCO comprising:
- a reference current source generating module, comprising:
- an amplifier, comprising:
- a positive input end, for receiving the reference voltage;
- an negative end;
- and
- an output end, coupled to the negative end of the amplifier;
- a resistor, coupled between the negative end of the amplifier and a ground end;
- and
- a first transistor, comprising:
- a first end, coupled to a bias voltage source;
- a control end, coupled to the output end of the amplifier;
- and
- a second end, the first transistor generating a reference current according to the reference voltage;
- and
- a clock signal generating module, for outputting the clock signal with the corresponding frequency according to the reference current.
Dependencies are inferred from the claim text.