Stanford Research Systems SIM954 Operation And Service Manual page 43

3.9 Overdrive Behavior
TDS 3034 15 Jul 2008 15:48:18
Figure 3.15: The SIM954 driven with 1 kHz
triangle wave to 2 A
SIM954 300 MHz Dual Inverting Driver Amplifier
The signal rectification is a design feature of the circuit and does not
indicate a fault condition.
A di erent kind of soft overdrive behavior happens for low impedance
loads when the current limit is reached. In this case, the amplifier
will exhibit a monotonic soft clipping behavior as shown in figures
3.15 and 3.16.
into 1
pp
Ultimately, near the safe temperature limit for silicon devices, the
temperature protection circuits inside each operational amplifier will
engage and shut the device down.
If an application requires hard clipping, we suggest to use the SIM914
Preamplifier or the SIM964 Analog Limiter. The SIM914 will limit
at approximately 2 V output signal level. When cascaded with a
SIM954, it will result in approximately 8 V of clipping amplitude
with 3 ns of input recovery from overload while providing 200 MHz
of combined bandwidth while in linear mode.
The SIM964, on the other hand, allows 1 MHz bandwidth and 10 mV
resolution for both upper and lower limits.
TDS 3034 15 Jul 2008 15:59:40
Figure 3.16: The SIM954 overdriven with
1 kHz triangle wave to
3 – 19
2 A into 1
pp