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GB2019151A - Improvements in sampled analog filters - Google Patents

Improvements in sampled analog filters

Info

Publication number
GB2019151A
GB2019151A GB7911528A GB7911528A GB2019151A GB 2019151 A GB2019151 A GB 2019151A GB 7911528 A GB7911528 A GB 7911528A GB 7911528 A GB7911528 A GB 7911528A GB 2019151 A GB2019151 A GB 2019151A
Authority
GB
United Kingdom
Prior art keywords
input
signal source
phi
switched capacitor
analog filters
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
Application number
GB7911528A
Other versions
GB2019151B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of GB2019151A publication Critical patent/GB2019151A/en
Application granted granted Critical
Publication of GB2019151B publication Critical patent/GB2019151B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H19/00—Networks using time-varying elements, e.g. N-path filters
    • H03H19/004—Switched capacitor networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Networks Using Active Elements (AREA)

Abstract

An integrator circuit of the type having an operational amplifier with an integrating capacitor (C1) in a feedback loop from its output to its input and having a switched capacitor (K0C1) as equivalent of a resistor connection between a signal source and said input, is characterized in that said switched capacitor is alternately discharged and connected between said signal source and said input with a predetermined frequency, by means of FET switches operated by clock pulses phi 1, phi 2. A second stage of similar form, but having its switches energised in a different sequence is connected in cascade with the first to provide a second order biquadratic filter. <IMAGE>
GB7911528A 1978-04-03 1979-04-03 Sampled analogue filters Expired GB2019151B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000300294A CA1088161A (en) 1978-04-03 1978-04-03 Sampled analog filters

Publications (2)

Publication Number Publication Date
GB2019151A true GB2019151A (en) 1979-10-24
GB2019151B GB2019151B (en) 1982-06-16

Family

ID=4111142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7911528A Expired GB2019151B (en) 1978-04-03 1979-04-03 Sampled analogue filters

Country Status (5)

Country Link
JP (1) JPS553291A (en)
CA (1) CA1088161A (en)
FR (1) FR2422292A1 (en)
GB (1) GB2019151B (en)
SE (1) SE7902918L (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491243A1 (en) * 1980-10-01 1982-04-02 Asulab Sa DEVICE FOR PROCESSING A VARIABLE ELECTRIC SIGNAL BY MULTIPLEXING
US4468749A (en) * 1980-08-20 1984-08-28 Fujitsu Limited Adjustable attenuator circuit
EP0109612A3 (en) * 1982-11-19 1986-05-14 Kabushiki Kaisha Toshiba Switched capacitor filter circuit
US4855627A (en) * 1987-01-14 1989-08-08 Kabushiki Kaisha Toshiba Filter circuit
GB2233522A (en) * 1988-04-11 1991-01-09 American Telephone & Telegraph Switched-capacitor circuit with large time constant

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448249A1 (en) * 1979-02-02 1980-08-29 Thomson Csf SAMPLING FILTER AND SELF-SWITCHING DEVICE COMPRISING SUCH A FILTER
DE3001969C2 (en) * 1980-01-21 1982-10-28 Siemens AG, 1000 Berlin und 8000 München Electrical filter circuit using at least one simulated inductor containing controlled switches, capacitors and amplifiers
JPS56126311A (en) * 1980-03-10 1981-10-03 Nippon Telegr & Teleph Corp <Ntt> Switched capacitor circuit
DE3022252C2 (en) * 1980-06-13 1983-06-23 Siemens AG, 1000 Berlin und 8000 München Electrical filter circuit for processing analog scanning signals
JPS5726916A (en) * 1980-07-25 1982-02-13 Hitachi Ltd Switched capacitor
GB2084822A (en) * 1980-09-19 1982-04-15 Philips Electronic Associated Switchable analogue signal inverter
JPS5787234A (en) * 1980-11-18 1982-05-31 Seiko Epson Corp Signal inverter
JPS5787618A (en) * 1980-11-21 1982-06-01 Seiko Epson Corp Switched capacitor filter
JPS57202126A (en) * 1981-06-05 1982-12-10 Toko Inc Digital-to-analog converter
JPS5839109A (en) * 1981-09-01 1983-03-07 Toshiba Corp Low-pass filter
JPH02276351A (en) * 1990-03-26 1990-11-13 Seiko Epson Corp FSK demodulation circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468749A (en) * 1980-08-20 1984-08-28 Fujitsu Limited Adjustable attenuator circuit
FR2491243A1 (en) * 1980-10-01 1982-04-02 Asulab Sa DEVICE FOR PROCESSING A VARIABLE ELECTRIC SIGNAL BY MULTIPLEXING
EP0109612A3 (en) * 1982-11-19 1986-05-14 Kabushiki Kaisha Toshiba Switched capacitor filter circuit
US4855627A (en) * 1987-01-14 1989-08-08 Kabushiki Kaisha Toshiba Filter circuit
GB2233522A (en) * 1988-04-11 1991-01-09 American Telephone & Telegraph Switched-capacitor circuit with large time constant

Also Published As

Publication number Publication date
SE7902918L (en) 1979-10-04
CA1088161A (en) 1980-10-21
FR2422292A1 (en) 1979-11-02
GB2019151B (en) 1982-06-16
JPS553291A (en) 1980-01-11

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee