WO2001043278A1 - Amplificateur d'adaptation d'impedance a faible distorsion faisant intervenir une technique de suppression de distorsion - Google Patents
Amplificateur d'adaptation d'impedance a faible distorsion faisant intervenir une technique de suppression de distorsion Download PDFInfo
- Publication number
- WO2001043278A1 WO2001043278A1 PCT/US2000/033016 US0033016W WO0143278A1 WO 2001043278 A1 WO2001043278 A1 WO 2001043278A1 US 0033016 W US0033016 W US 0033016W WO 0143278 A1 WO0143278 A1 WO 0143278A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stage
- amplifier
- transistor
- output
- distortion
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
- H03F3/082—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with FET's
Definitions
- This invention is related to optical receivers and more particularly to a front
- Optical receivers are typically utilized in communication systems for receiving
- optical signals and transforming them into electrical signals.
- electrical signals The electrical signals
- CATV network a CATV network
- a CATV network typically consists of a downstream path extending from a
- the upstream path typically
- systems can be designed to be partially optical and partially electrical.
- partially optical and partially electrical For example,
- downstream directions can be accomplished utilizing optical signals while
- optical receivers to be located at both the nodes
- Optical receivers are necessary at each node for receiving optical signals in
- optical receivers are necessary at the head end to receive optical communications
- Transimpedance amplifiers have been widely used in optical digital receivers.
- EINC Equivalent Input Noise Current
- the second order distortions can be much lower than the
- the invention addresses the above mentioned problem by providing a method
- a transimpedance amplifier having a first input stage, a voltage amplifier
- FIG. 1 is a block diagram of the transimpedance amplifier according to the
- Figure 2 is an exemplary schematic of an implementation of the block
- Figure 3 shows waveforms (including second order distortion waveforms)
- Figure 4 shows a graph of negative bias voltage vs. second order distortion
- the transimpedance amplifier 10 consists of four major components. First, an
- optical input 15 is received into an optical to electrical transducer 20.
- the optical to electrical transducer 20 is a low voltage signal supplied into the input
- stage 30 which serves to convert this low voltage signal to a current signal.
- voltage amplifier stage 40 receives the current signal, amplifies it, and feeds it into
- an emitter follower stage 50 By design, the emitter follower stage 50 also creates
- a feedback 60 flows from the
- An optical signal 15 is supplied to photo diode PD.
- the photo diode PD is negative biased and
- the input stage 30 consists of transistor Q l3 resistors R,, R 2 and R 6 and
- the transistor Q is preferably a GaAs MESFET. It should
- the gate of the transistor Q is connected to the
- the voltage amplifier stage 40 consists of transistor Q 2 , and resistors R s , R 7
- the transistor Q 2 is preferably a P-N-P BJT. It should be
- the output of the transistor Qj goes to the emitter of the transistor Q 2 through resistor Rg and capacitor C ⁇ 0 .
- resistors R 3 , R 4 , R 16 and capacitor C 3 are connected to a voltage source 35 through resistors R 3 , R 4 , R 16 and capacitor C 3 .
- Resistors R 2 , Rg, R 16 and R 8 are small value resistors used to prevent unwanted high
- the emitter follower stage 50 consists of transistor Q 3 , resistors R 8 , R 9 , R n
- the transistor Q 3 is a N-P-N BJT.
- the transistor Q 3 is connected to the voltage source 35.
- the emitter supplies a signal
- the feedback loop 60 consists of
- Resistor R 12 is connected to the gate of the transistor Q j .
- Resistor R 7 is
- Resistor R ⁇ is connected between emitter of Q 3 and the negative bias
- An optional optical power monitor may
- resistor R 13 or R ⁇ .
- the photodiode PD supplies
- This signal S 0 is usually a low voltage broadband radio frequency (RF) signal
- the transistor Q converts this voltage signal S 0 to a current signal I j
- the output of the transistor Q 2 collector is an amplified signal
- the signal S 2 is supplied to the transistor Q 3 at its base.
- the transistor Q 3 also serves as a signal S 2 and
- S 3d must be controlled to match the amplitude of distortion signal in S 2d in order to
- distortion cancellation methodology can be further explained mathematically by first estimating the distortion produced in the transistor Q t and then determining the
- V gs is the voltage between gate and source.
- V p is the
- the output voltage of the emitter follower is basically equal to the output
- stage 40 is given by:
- V 2 - g M R,V m (Eq. 2)
- the output voltage on the transistor Q 2 collector will be:
- the voltage on the output transistor Q 2 will be:
- V 2 - CR 7 1 - V... (Eq. 5)
- A is the amplification of the voltage amplifier stage.
- V p is 1.3V.
- V dc is 0.6V.
- V 3 is approximately 0.8 volts (peak value).
- the second order distortion created by GaAs MESFET transistor Q can be any suitable second order distortion created by GaAs MESFET transistor Q.
- the emitter follower second order distortion comes from the internal emitter
- I e is the emitter follower stage emitter current in milliamps.
- emitter current can be an instant current.
- emitter follower has lower output
- the I e swing can be large at large RF output. This I e current swing
- the first stage MESFET transistor Qj is a current square device. In the first
- emitter follower transistor Q 3 is the other second order distortion generator.
- stage 30 to become larger.
- the GaAs MESFET transistor Q will generate more
- Figure 4 shows the experimental second order distortion data versus negative
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU18168/01A AU1816801A (en) | 1999-12-10 | 2000-12-06 | Low distortion transimpedance amplifier using distortion cancellation technique |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17012799P | 1999-12-10 | 1999-12-10 | |
US60/170,127 | 1999-12-10 | ||
US53306400A | 2000-03-22 | 2000-03-22 | |
US09/533,064 | 2000-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001043278A1 true WO2001043278A1 (fr) | 2001-06-14 |
Family
ID=26865734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/033016 WO2001043278A1 (fr) | 1999-12-10 | 2000-12-06 | Amplificateur d'adaptation d'impedance a faible distorsion faisant intervenir une technique de suppression de distorsion |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU1816801A (fr) |
TW (1) | TW472441B (fr) |
WO (1) | WO2001043278A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1732209A1 (fr) * | 2005-06-09 | 2006-12-13 | Emcore Corporation | Suppression de la distorsion dans un circuit amplificateur à transimpédance |
US7596326B2 (en) | 2005-10-27 | 2009-09-29 | Emcore Corporation | Distortion cancellation circuitry for optical receivers |
US7634198B2 (en) | 2006-06-21 | 2009-12-15 | Emcore Corporation | In-line distortion cancellation circuits for linearization of electronic and optical signals with phase and frequency adjustment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3338024A1 (de) * | 1983-10-20 | 1985-05-02 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Verstaerker mit strom-spannungswandlung, insbesondere vorverstaerker eines optischen empfaengers |
GB2164515A (en) * | 1984-09-13 | 1986-03-19 | American Telephone & Telegraph | Improvements in or relating to optical receivers |
US4882482A (en) * | 1988-10-26 | 1989-11-21 | Tektronix, Inc. | Thermally stabilized optical preamplifier |
-
2000
- 2000-12-06 AU AU18168/01A patent/AU1816801A/en not_active Abandoned
- 2000-12-06 WO PCT/US2000/033016 patent/WO2001043278A1/fr active Application Filing
- 2000-12-08 TW TW89126157A patent/TW472441B/zh active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3338024A1 (de) * | 1983-10-20 | 1985-05-02 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Verstaerker mit strom-spannungswandlung, insbesondere vorverstaerker eines optischen empfaengers |
GB2164515A (en) * | 1984-09-13 | 1986-03-19 | American Telephone & Telegraph | Improvements in or relating to optical receivers |
US4882482A (en) * | 1988-10-26 | 1989-11-21 | Tektronix, Inc. | Thermally stabilized optical preamplifier |
Non-Patent Citations (1)
Title |
---|
KOBAYASHI K W ET AL: "A NOVEL MONOLITHIC LINEARIZED HEMT LNA USING HBT TUNEABLE ACTIVE FEEDBACK", IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST,US,NEW YORK, IEEE, 17 June 1996 (1996-06-17), pages 1217 - 1220, XP000720569, ISBN: 0-7803-3247-4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1732209A1 (fr) * | 2005-06-09 | 2006-12-13 | Emcore Corporation | Suppression de la distorsion dans un circuit amplificateur à transimpédance |
US7596326B2 (en) | 2005-10-27 | 2009-09-29 | Emcore Corporation | Distortion cancellation circuitry for optical receivers |
US7634198B2 (en) | 2006-06-21 | 2009-12-15 | Emcore Corporation | In-line distortion cancellation circuits for linearization of electronic and optical signals with phase and frequency adjustment |
Also Published As
Publication number | Publication date |
---|---|
AU1816801A (en) | 2001-06-18 |
TW472441B (en) | 2002-01-11 |
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