Voltage mode relaxation oscillator
AssigneeSeoul National University R&Db Foundation
InventorsJaekwang Yun, Suhwan Kim
Life of this patent
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Abstract
A voltage mode relaxation oscillator includes a bandgap reference (BGR) circuit configured to generate a BGR voltage that does not depend on temperature and a BGR current that depends on temperature; a control voltage generating circuit configured to generate a control voltage that does not depend on temperature based on the BGR voltage; a reference current generating circuit configured to generate a reference current that does not depend on temperate based on the BGR current; and an oscillator circuit configured to generate a clock signal that does not depend on temperature based on the control voltage and the reference current.
Claims6
A voltage mode relaxation oscillator comprising:
- a bandgap reference (BGR) circuit configured to generate a BGR voltage that does not depend on temperature and a BGR current that depends on temperature;
- a control voltage generating circuit configured to generate a control voltage that does not depend on temperature based on the BGR voltage;
- a reference current generating circuit configured to generate a reference current that does not depend on temperature based on the BGR current, the reference current generating circuit comprising:
- an input circuit having a first node receiving the BGR current and coupled between the first node and a ground node;
- an operational amplifier having a positive input node coupled to the first node;
- and
- an output circuit coupled to an output node of the operational amplifier, the output circuit comprising:
- a transistor having a gate coupled to the output node of the operational amplifier and a source coupled to a negative input node of the operational amplifier;
- and
- a load resistor coupled between the negative input node of the operational amplifier and the ground node;
- and
- an oscillator circuit configured to generate a clock signal that does not depend on temperature based on the control voltage and the reference current.
Dependencies are inferred from the claim text.