GB1228511A - - Google Patents

Info

Publication number
GB1228511A
GB1228511A GB1342169A GB1228511DA GB1228511A GB 1228511 A GB1228511 A GB 1228511A GB 1342169 A GB1342169 A GB 1342169A GB 1228511D A GB1228511D A GB 1228511DA GB 1228511 A GB1228511 A GB 1228511A
Authority
GB
United Kingdom
Prior art keywords
filter
path
period
order
band
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.)
Expired
Application number
GB1342169A
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 filed Critical
Publication of GB1228511A publication Critical patent/GB1228511A/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
    • H03H19/002—N-path filters

Landscapes

  • Filters That Use Time-Delay Elements (AREA)
  • Filters And Equalizers (AREA)
  • Dc Machiner (AREA)

Abstract

1,228,511. Active filters. MARCONI CO. Ltd. 5 Nov., 1969 [14 March, 1969], No. 13421/69. Heading H3U. In a commutated n-path band stop filter, the time period for which each path is selected is less than <SP>1</SP>/ n th of the period of a complete switching cycle, e.g. “n. In order to further improve selectivity, a sample and hold circuit 15, 16 may be connected to the output or, Fig. 18 (not shown), to the input of the n-path filter. The sampling switch 15 is closed for a short time about the centre of the make period of each commutator switch 5 ... 8. In order to remove the higher order stop-band, the filter may be followed by a low-pass filter 14.
GB1342169A 1969-03-14 1969-03-14 Expired GB1228511A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1342169 1969-03-14
DE19702017285 DE2017285B2 (en) 1969-03-14 1970-04-10 BAND BARRIER FILTER

Publications (1)

Publication Number Publication Date
GB1228511A true GB1228511A (en) 1971-04-15

Family

ID=25758952

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1342169A Expired GB1228511A (en) 1969-03-14 1969-03-14

Country Status (5)

Country Link
US (1) US3603898A (en)
DE (1) DE2017285B2 (en)
GB (1) GB1228511A (en)
NL (1) NL161937C (en)
SE (1) SE363552B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491223A (en) * 2012-03-09 2012-11-28 Renesas Mobile Corp A cascade connection of a continuous-time filter and a peaking N-path filter

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761816A (en) * 1972-09-08 1973-09-25 Bell Telephone Labor Inc Data set employing a commutating capacitor, tracking, notch filter
US4039979A (en) * 1975-06-18 1977-08-02 Bell Telephone Laboratories, Incorporated Reduction of aliasing distortion in sampled signals
GB1534319A (en) * 1976-08-20 1978-11-29 Cossor Ltd A C Electrical filter networks
JPS53116052A (en) * 1977-03-18 1978-10-11 Nec Corp Band pass filter
US4392068A (en) * 1981-07-17 1983-07-05 General Electric Company Capacitive commutating filter
JP2715770B2 (en) * 1991-12-26 1998-02-18 日本電気株式会社 Time constant detection circuit and time constant adjustment circuit
US5574633A (en) * 1994-02-23 1996-11-12 At&T Global Information Solubions Company Multi-phase charge sharing method and apparatus
USRE38918E1 (en) 1994-04-22 2005-12-13 University Of Southern California System and method for power-efficient charging and discharging of a capacitive load from a single source
US5473526A (en) * 1994-04-22 1995-12-05 University Of Southern California System and method for power-efficient charging and discharging of a capacitive load from a single source
JPH10154026A (en) * 1996-11-22 1998-06-09 Alps Electric Co Ltd Battery-incorporated electronic equipment
US6985142B1 (en) * 1998-09-03 2006-01-10 University Of Southern California Power-efficient, pulsed driving of capacitive loads to controllable voltage levels
US7502603B2 (en) * 2005-06-03 2009-03-10 Maxim Integrated Products, Inc. DC cancellation in zero-IF receivers
US9136825B2 (en) 2012-06-13 2015-09-15 Nokia Technologies Oy Method and device for implementing tracking filters and RF front end of software defined radios
US9136815B2 (en) * 2012-06-13 2015-09-15 Nokia Technologies Oy Methods and apparatuses for implementing variable bandwidth RF tracking filters for reconfigurable multi-standard radios
US9264009B2 (en) * 2013-03-15 2016-02-16 Avago Technologies General Ip (Singapore) Pte. Ltd. AC coupling circuit with hybrid switches and constant load
US9407482B2 (en) * 2013-11-11 2016-08-02 Nokia Technologies Oy Tunable RF N-path filter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584986A (en) * 1946-04-24 1952-02-12 Fed Telephone & Radio Corp Selective wave filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491223A (en) * 2012-03-09 2012-11-28 Renesas Mobile Corp A cascade connection of a continuous-time filter and a peaking N-path filter
GB2491223B (en) * 2012-03-09 2013-08-07 Renesas Mobile Corp Filter
US9112566B2 (en) 2012-03-09 2015-08-18 Broadcom Corporation Filter

Also Published As

Publication number Publication date
NL7002410A (en) 1970-09-16
US3603898A (en) 1971-09-07
NL161937B (en) 1979-10-15
DE2017285A1 (en) 1971-11-04
NL161937C (en) 1980-03-17
DE2017285C3 (en) 1973-01-04
SE363552B (en) 1974-01-21
DE2017285B2 (en) 1972-06-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee