Title:
【発明の名称】出力回路
Document Type and Number:
Japanese Patent JP3288727
Kind Code:
B2
Abstract:
An output circuit comprises an output transistor, a reference oscillator, a variable frequency oscillator, and a control circuit. The reference oscillator produces a first signal of a reference frequency according to the ideal ON resistance of the output transistor. The variable frequency oscillator generates a second signal capable of varying the oscillation frequency. The phase comparator compares the phase of a first signal from the reference oscillator with that of a second signal from the variable frequency oscillator and then controls the oscillation frequency of the variable frequency oscillator so that these two phases may coincide with each other. The control circuit controls the output transistor so that the current driving capability may be kept constant according to the output of the phase comparator.
Inventors:
Tsukasa Shiratori
Application Number:
JP12010091A
Publication Date:
June 04, 2002
Filing Date:
May 24, 1991
Export Citation:
Assignee:
Toshiba Corporation
Toshiba Microelectronics Corporation
Toshiba Microelectronics Corporation
International Classes:
G11C11/413; G11C11/409; H03K3/011; H03K5/13; H03K5/131; H03K17/14; H03K19/003; H03K19/0175; H03L7/06; (IPC1-7): G11C11/413; H03K5/13; H03K17/14; H03K19/0175; H03L7/06
Domestic Patent References:
| JP29222A |
Attorney, Agent or Firm:
Takehiko Suzue