Invention Grant
- Patent Title: Reference voltage generation circuit, oscillation circuit including the same and method for calibrating oscillation frequency of oscillation circuit
- Patent Title (中): 参考电压产生电路，包括振荡电路的振荡电路和校准振荡电路的振荡频率的方法
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Application No.: US13691441Application Date: 2012-11-30
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Publication No.: US09112510B2Publication Date: 2015-08-18
- Inventor: Kiyoshi Ishikawa
- Applicant: FUJITSU SEMICONDUCTOR LIMITED
- Applicant Address: JP Yokohama
- Assignee: SOCIONEXT INC.
- Current Assignee: SOCIONEXT INC.
- Current Assignee Address: JP Yokohama
- Agency: Arent Fox LLP
- Priority: JP2012-003115 20120111
- Main IPC: G05F1/10
- IPC: G05F1/10 ; G05F3/02 ; H03L7/00 ; H03F3/45 ; G05F3/30 ; H03L1/00 ; H03L1/02 ; G11C5/14 ; H03K3/0231
Abstract:
A reference voltage generation circuit has: a first PN junction element; a second PN junction element having a higher forward direction voltage than the first PN junction element; a first differential amplifier inputting an anode of the first PN junction element and a first connection node between a first and a second resistor disposed in series between a first output of the first differential amplifier and a first potential, and generating a first output voltage at the first output; and a second differential amplifier inputting an anode of the second PN junction element and a second connection node between a fourth and a third resistor disposed in series between a second output of the second differential amplifier and the first output of the first differential amplifier, and generating a reference voltage at the second output. A resistance ratio between the third and the fourth resistors is variable.
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