HMMC-3028 Datasheet, PDF (4/9 Pages) Agilent(Hewlett-Packard) – DC-12 GHz High Efficiency GaAs HBT MMIC Divide-by-8 Prescaler

Input Preamplifier Stage
Post Amplifier Stage
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Figure 1. Simplified Schematic
Applications
The HMMC-3028 is designed for use in
high frequency communications, micro-
wave instrumentation, and EW radar
systems where low phase-noise PLL
control circuitry or broad-band frequency
translation is required.
Operation
The device is designed to operate
when driven with either a single-ended
or differential sinusoidal input signal
over a 200 MHz to
12 GHz bandwidth. Below 200 MHz the
prescaler input is “slew-rate” limited,
requiring fast rising and falling edge
speeds to properly
divide. The device will operate at fre-
quencies down to dc when driven with
a square-wave.
The device may be biased from either a
single positive or single negative sup-
ply bias. The backside of the device is
not dc
connected to any dc bias point
on the device.
For positive supply operation V_CC is
nominally biased at any voltage in the
+4.5 to +6.5 volt range with V_EE (or V_EE
& V_PwrSel) grounded. For negative bias
operation V_CC
is typically grounded and a
negative voltage between -4.5
to -6.5 volts is applied to V_EE
(or V_EE & V_PwrSel).
Several features are designed into this
prescaler:
1. Dual-Output Power Feature
Bonding both V_EE and V_PwrSel pads to
either ground (positive bias mode) or
the negative
supply (negative bias mode),
will deliver _~0 dBm [0.5 V_p–p]
at the RF output port while drawing
~40 ^{mA supply current. Eliminating}
the V_PwrSel connection results in re-
duced output power and voltage swing,
-6.0 dBm
[0.25 V_p–p] but at a reduced current
draw of _~30 mA resulting in less over-
all power dissipation.
(NOTE: V_EE must ALWAYS
be bonded and V_PwrSel must
NEVER be biased to any
potential other than V_EE
or open-circuited.)
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