JPS647329A - Recording medium driver - Google Patents
Recording medium driverInfo
- Publication number
- JPS647329A JPS647329A JP16084187A JP16084187A JPS647329A JP S647329 A JPS647329 A JP S647329A JP 16084187 A JP16084187 A JP 16084187A JP 16084187 A JP16084187 A JP 16084187A JP S647329 A JPS647329 A JP S647329A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- amplifier
- emitter
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To attain wide band for the signal processing system, low offset and low noise and to make the driver small in size by using a current mirror an output of a detected focusing error signal. CONSTITUTION:A photodetector 1 comprising a PIN photodiode gives an output current IPD proportional to the input line to a current mirror circuit 15. Base potentials of transistors (TRs) 3-8 in the circuit 15 are always identical to each other and an emitter current flowing to each resistor is made equal by adjusting en emitter-base voltage of each TR and a resistance of resistors 9-14 corresponding thereto depending on the required accuracy of the amplifier. Then the circuit 15 acts like an amplifier having a current amplification factor of 5 times.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62160841A JPH0770064B2 (en) | 1987-06-30 | 1987-06-30 | Recording medium drive |
US07/212,566 US5004901A (en) | 1987-06-04 | 1988-06-28 | Current mirror amplifier for use in an optical data medium driving apparatus and servo-circuit |
US07/645,182 US5317143A (en) | 1987-06-04 | 1991-01-23 | Optical data medium driving apparatus and a servo circuit with normalization processing |
US07/983,088 USRE34769E (en) | 1986-01-16 | 1992-11-27 | Current mirror amplifier for use in an optical data medium driving apparatus and servo-circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62160841A JPH0770064B2 (en) | 1987-06-30 | 1987-06-30 | Recording medium drive |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS647329A true JPS647329A (en) | 1989-01-11 |
JPH0770064B2 JPH0770064B2 (en) | 1995-07-31 |
Family
ID=15723564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62160841A Expired - Lifetime JPH0770064B2 (en) | 1986-01-16 | 1987-06-30 | Recording medium drive |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0770064B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4948745A (en) * | 1989-05-22 | 1990-08-14 | Motorola, Inc. | Process for elevated source/drain field effect structure |
EP0508522A2 (en) * | 1991-04-08 | 1992-10-14 | Koninklijke Philips Electronics N.V. | Optical recording and/or reading apparatus |
JP2012015511A (en) * | 2004-02-26 | 2012-01-19 | Semiconductor Energy Lab Co Ltd | Circuit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009014155A1 (en) * | 2007-07-25 | 2009-01-29 | Semiconductor Energy Laboratory Co., Ltd. | Photoelectric conversion device and electronic device having the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6365122U (en) * | 1986-10-17 | 1988-04-28 |
-
1987
- 1987-06-30 JP JP62160841A patent/JPH0770064B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6365122U (en) * | 1986-10-17 | 1988-04-28 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4948745A (en) * | 1989-05-22 | 1990-08-14 | Motorola, Inc. | Process for elevated source/drain field effect structure |
EP0508522A2 (en) * | 1991-04-08 | 1992-10-14 | Koninklijke Philips Electronics N.V. | Optical recording and/or reading apparatus |
EP0508522A3 (en) * | 1991-04-08 | 1993-03-03 | N.V. Philips' Gloeilampenfabrieken | Optical recording and/or reading apparatus |
JP2012015511A (en) * | 2004-02-26 | 2012-01-19 | Semiconductor Energy Lab Co Ltd | Circuit |
US8678958B2 (en) | 2004-02-26 | 2014-03-25 | Semiconductor Energy Laboratory Co., Ltd. | Sports implement, amusement tool, and training tool |
Also Published As
Publication number | Publication date |
---|---|
JPH0770064B2 (en) | 1995-07-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0202708A3 (en) | D.c. block capacitor circuit | |
EP0296762A2 (en) | Improved operational transconductance amplifier for use in sample-and-hold circuits and the like | |
EP0346011A3 (en) | Amplifiers | |
ATE83326T1 (en) | SIGNAL PROCESSING DEVICE WITH LEVEL ADJUSTMENT CIRCUIT. | |
ATE42635T1 (en) | FLOWMETER WITH A TEMPERATURE SENSITIVE RESISTANCE ELEMENT. | |
US4839609A (en) | Differential amplifier | |
JPS647329A (en) | Recording medium driver | |
US4714894A (en) | Operational amplifier | |
FR2500969B1 (en) | LINEAR AMPLIFIER AND GAIN CONTROL AMPLIFIER CIRCUIT COMPRISING AT LEAST ONE SUCH AMPLIFIER | |
KR920009110A (en) | Infrared receiver circuit | |
KR930003543A (en) | Current mirror circuit | |
JPS60208106A (en) | Differential amplifier | |
US4853609A (en) | Distortion-free, opposite-phase current source | |
US4766396A (en) | Current source type current output circuit using current mirrors | |
KR900011140A (en) | Bias Circuit of A / D Converter | |
EP0841747A3 (en) | Fast buffer | |
GB1507525A (en) | Amplifier circuits | |
US5394108A (en) | Non-linear burst mode data receiver | |
JPS57208717A (en) | Control circuit for voltage control variable attenuator | |
SU1499428A1 (en) | Sensor of power bus current | |
CA1219044A (en) | Method of and apparatus for low noise current amplification | |
SU1462467A1 (en) | Variable-gain amplifier | |
JP2507081B2 (en) | Optical integrated circuit | |
EP0180337A3 (en) | Buffer circuit | |
DE69725362D1 (en) | Electronic volume control circuit with controlled output characteristics |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |