Ultra high linearity amplifier

Details Ultra high linearity amplifier Ultra high linearity amplifier

2007-08-28

2007-08-28

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S297000

Reexamination Certificate

active

11259507

ABSTRACT:
The output of a commercially available integrated high gain differential amplifier that already has reasonable linearity is connected back to the (−) input to obtain the well known circuit configuration for a non-inverting amplifier, whose gain may be unity or greater, and whose linearity in response to the (+) input is to be improved. We operate the part with power supplies that are dynamically varied to always be the amplifier input+N volts and that input−N volts. This allows the part to remain a low voltage swing part (±N volts) even though the actual output might swing several times that ±N volts. It improves linearity because the part is almost always operating at nearly ‘the same operating point’ relative to the perceived power supplies. The dynamically tracking power supplies maybe obtained from plus and minus higher voltage work supplies and the use of symmetrical current mirrors to produce matched ±N volt offsets that are referenced to the input of the amplifier.

REFERENCES:
patent: 4479093 (1984-10-01), Mattisson
patent: 5424683 (1995-06-01), Takahashi
patent: 6040741 (2000-03-01), Van der Pol

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