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Genesis Reference Amplifier Owners Manual Ver 2.0 11
available into lower impedance loads and better micro-dynamics – one
listener described it as “having cream in your coffee instead of non-fat soy”.
Silent Running Voltage Supply
4
We recognized that published specifications for noise rejection of opamps
and even discrete small-signal amplification circuits did not always tell the
whole story. The problem is that Power Supply Rejection Ratio, or PSRR, is
specified at one frequency – usually 1kHz, but the truth is that this rapidly
gets worse as the frequency rises.
For the GR-Amp, a low-current regulated voltage supply was developed that
has broad bandwidth noise rejection so that incoming noise does not intrude
on your music. Like the DPDS, the SRVS is also based on the design of
power supplies for tube amplifier design. Because of the high voltages
involved, tube amplifiers use relatively small capacitors and chokes to
produce smooth DC power.
The electronics used for
regulation have to be
noiseless and fast.
Generally noiseless is not
a problem, fast is a great
problem. Most commercial
regulators are good for
about 100 kHz. Most
chokes are good for at
least 1 MHz.
The electronic regulator
used in the GR-Amp
exceeds the specifications
of an excellent choke. It is
an exceedingly fast
discrete circuit and not a
generic design. Spectrum analysis up to 16 MHz implies a very high
bandwidth, as there is no apparent degradation at that frequency. The circuit
is of low enough impedance to outperform commercial regulators by at least
10 dB. This is despite the fact that no loop feedback is used in this circuit. To
avoid any speculation, it is not a shunt device, it is not a capacitative
multiplier, and it does not employ chokes.
4
Genesis would like to credit Engr. Nigel Pearson for the design of the
SRVS.
Audio Band Noise Rejection (over –90dB flat all the way up to 40kHz)