GB1035042A - Low-pass electrical filter circuits - Google Patents

Low-pass electrical filter circuits

Info

Publication number
GB1035042A
GB1035042A GB2275263A GB2275263A GB1035042A GB 1035042 A GB1035042 A GB 1035042A GB 2275263 A GB2275263 A GB 2275263A GB 2275263 A GB2275263 A GB 2275263A GB 1035042 A GB1035042 A GB 1035042A
Authority
GB
United Kingdom
Prior art keywords
transistor
input
amplifier
input signal
frequency
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
GB2275263A
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.)
Sperry Corp
Original Assignee
Sperry Rand Corp
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 Sperry Rand Corp filed Critical Sperry Rand Corp
Publication of GB1035042A publication Critical patent/GB1035042A/en
Expired legal-status Critical Current

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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • 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
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

1,035,042. Transistor amplifying circuits. SPERRY RAND CORPORATION. June 7, 1963 [June 8, 1962], No. 22752/63. Heading H3T. A low-pass electrical filter circuit comprises an input terminal between which and an earth connection an input signal is applied and which is connected through a first resistor to an output terminal, and a high-gain phase-inverting low imput impedance amplifier having its input and output circuits coupled to the output terminal through first and second capacitors respectively. The values of the capacitors are such that the attenuation factor of the filter is a second order function of the frequency of the input signal and the attenuation rises with frequency for frequencies above the resonant frequency. As shown in Fig. 1, one input terminal 10 of the filter is connected through variable resistor R1 to one output terminal. The amplifier comprises a transistor common emitter stage T1 followed by a common collector stage T2, the input signal to the amplifier being applied through capacitor C1 and negative feedback being provided between the emitter of transistor T2 and lead 25 by capacitor C2 and between the base of transistor T1 and a tapping on the emitter impedance R3, R4 of transistor T2. In operation, the D.C. component of the input signal e 1 passes directly to output terminal 26 and the A.C. component passes to phase inverting amplifier T1, the current passing through capacitor C1 being directly proportional to the magnitude and frequency of the input signal. Due to the negative feedback over capacitor C2 and choice of values of the components the A.C. components appearing at the output of the filter are highly attenuated at frequencies above a predetermined frequency. The feedback signal through resistor R3 to input of transistor T1 serves to stabilize the amplifier and lower the input impedance.
GB2275263A 1962-06-08 1963-06-07 Low-pass electrical filter circuits Expired GB1035042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20111562A 1962-06-08 1962-06-08

Publications (1)

Publication Number Publication Date
GB1035042A true GB1035042A (en) 1966-07-06

Family

ID=22744549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2275263A Expired GB1035042A (en) 1962-06-08 1963-06-07 Low-pass electrical filter circuits

Country Status (1)

Country Link
GB (1) GB1035042A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1283411B (en) * 1966-09-30 1968-11-21 Siemens Ag Circuit arrangement for realizing a transfer factor of a low-pass filter with a complex pole pair

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1283411B (en) * 1966-09-30 1968-11-21 Siemens Ag Circuit arrangement for realizing a transfer factor of a low-pass filter with a complex pole pair

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