Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1977-11-21
1979-06-05
Heyman, John S.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
328163, 330149, H03H 704
Patent
active
041575083
ABSTRACT:
The problems associated with large bandwidth requirements and of precisely controlling the relative magnitudes of the distortion components generated in predistorters are resolved in a bridge-type cuber circuit (10). The cuber comprises a resistive bridge (R.sub.1, R.sub.2, R.sub.3, R.sub.4) which includes a pair of oppositely-poled diodes (D1, D2 and D3, D4) connected in parallel with the resistor (R.sub.1, R.sub.3) in each branch (25, 26) of one pair of opposite branches of said bridge. The parameters of the cuber, which is balanced with respect to fundamental frequency signals, are adjusted so that predominantly third order intermodulation components are generated, and an impedance match with the signal source is obtained.
The cuber circuit is used in a predistorter for cancelling third order distortion components produced in nominally linear amplifiers.
REFERENCES:
patent: 3383618 (1968-05-01), Engelbrecht
patent: 3428906 (1969-02-01), Pozzetti
patent: 3644836 (1972-02-01), Johnson
patent: 3825843 (1974-07-01), Felsberg et al.
patent: 4071781 (1978-01-01), Kayalioglu
Bell Telephone Laboratories Incorporated
Heyman John S.
Sherman Sylvan
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