associated glue logic, and interfacing with a PC via the serial port, is avail-
able from Maxim.)
Amplifiers with ultra high input impedance
High input impedances are required for bridge detector circuits used in
measuring small capacitances. An input impedance of 10 GQ at dc and
up to higher audio frequencies is easily arranged with modern devices.
Bootstrap
base
to bridge building
Bootstrapping is a powerful technique which has long featured in the
circuit designer's armoury. Its invention is often ascribed to A. D. Blumlein,
in connection with his pre-war work at the laboratories of EMI developing
the 40 ...
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