Document Type and Number:
Japanese Patent JPS5512769
Kind Code:
B1
Abstract:
1,219,933. Transistor amplifier circuits. SIEMENS A.G. 19 April, 1968 [20 April, 1967; 26 Jan., 1968], No. 18514/68. Heading H3T. An active filter comprises an amplifier having a push-pull input or output with a frequency selective bridge feedback network formed in part by the input or output impedance of the amplifier, the impedances of the bridge elements being such that a pair of zero points are obtained in the transmission characteristic of the filter. In one embodiment, Fig. 2, the feedback bridge I comprises the push-pull output impedance of the amplifier, a series CR arm, and a parallel CR arm. A further network II is also provided to give pole points in the characteristic. In an alternative arrangement, Fig. 7, an additional impedance is included between the two bridge arms at x, y and either a high or a low-pass characteristic may be obtained depending on whether y is connected back to the input, and x to the output or vice versa. Low-pass, high-pass and band-pass filters for push-pull inputs and single-ended outputs are also described, Figs. 10, 11, 12 (not shown).
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Application Number:
JP2653068A
Publication Date:
April 04, 1980
Filing Date:
April 20, 1968
Export Citation:
International Classes:
G06G7/625; H03F1/34; H03F1/36; H03F3/189; H03H11/12; (IPC1-7): H03H11/12