Spike insensitive intermediate frequency amplifier

Details Spike insensitive intermediate frequency amplifier Spike insensitive intermediate frequency amplifier

1996-08-13

1998-09-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345

Patent

active

058120270

ABSTRACT:
The intermediate frequency (IF) amplifier (10) of the invention comprises a differential stage (40) having transistors (41, 42) serially coupled to inductive loads (31, 32). There is only one point at common sources (node 45) which is sensitive to spikes. A feedback stage (60) extracts a common mode spike component at spike frequency (f.sub.S) from the output and returns a feedback signal to the sensitive point (node 45). Comparing to traditional differential amplifiers, the common mode rejection at resonance frequencies (f.sub.R) can be 30 times higher. This makes the amplifier (10) spike insensitive and suitable for the integration into mixed analog-digital chips, such as DSP chips, where the analog portions operate in the same frequency range as the digital portions.

REFERENCES:
patent: 5613233 (1997-03-01), Vagher

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