Step Recovery Diodes

A Step Recovery Diode (SRD) generates pulses that can be used to multiply
frequencies and to set up reference points, for example in synchronizing test
instruments.

This device operates by alternately producing and consuming a charge,
based on the frequency of its input signal. During forward bias, the SRD
conducts and builds up its charge. During reverse bias, the SRD maintains
conduction by consuming its charge. When the charge has been fully
consumed, the SRD snaps off, and very quickly reverts to zero conduction.

This device acts as a switch, controlling current flow by alternately storing and
releasing its charge, forming pulses at a repetition rate equal to the frequency
of its input.

The output of a Step Recovery Diode is most often used in two ways:

1. a pulse train can be applied to resonant circuits, which provides output power
   at a frequency above that of the original input,
2. a pulse train can be used to develop a series of frequencies at multiples of the
   original input frequencies.

Typical applications of Step Recovery Diodes include oscillators, power transmitters
and drivers, for telecommunications, telemetry, radar and test equipment.

Major characteristics include:

1. Output Frequency (fo),
2. Breakdown Voltage (VBR),
3. Junction Capacitance (Cj),
4. Minority Carrier Lifetime (tl),
5. Snap-offTime (tso),
6. Thermal Resistance (Rth),
7. Output Power (Po).
   

These diodes use mesa technology and oxide passivation. They support fast switching
and multiplier applications such as:

1. Very short pulse generation,
2. Ultra fast waveform shaping,
3. Comb generation,
4. High order multiplication, at moderate power ratings.

>>> learn mor (pdf 193kb)

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1. C2
2. F27d
3. SOT23