MPT 810VA VECTOR ATTENUATOR
FEATURES · FREQUENCY
RANGE OF 800 MHz TO 1000 MHz |
 |
| DESCRIPTIONS | ||
|
MPT 810VA is a vector attenuator in a 18-pin surface mount package of 01.0” X
0.9.” It is functionally equivalent to
the combination of an endless phase shifter and attenuator, at 800 MHz to 1000 MHz. MPT 810VA may be used anywhere it is necessary to
control the amplitude of a signal without introducing intermodulation distortion,
dispersion, or variation in group delay. While MPT 810VA is not architecturally similar to the combination of a phase shifter and attenuator, it serves the same purpose and has several other advantages. For example, there is no limitation on phase change. With no negligible delay variation, phase can increase or decrease continuously without reaching an end point. |
The 810VA can also go directly from any attenuation and phase to any other attenuation and
phase. For example, minimum attenuation at 0°
to minimum attenuation at 180°,
without a continuous phase transition from 0°
to 90°
to 180°. These qualities make the 810VA particularly useful in signal cancellation systems where the phase and amplitude of one signal must be adjusted so that it can be completely cancel another signal of arbitrary amplitude and phase.
Typical applications include gain and phase adjustment in the cancellation loops of feed -
forward amplifiers and in RF predistorters. |
|
810VA Block Diagram
MAXIMUM RATINGS
| Operating Temperatures | +40°C
to + 85 |
| RF Signal Input | 20 dBm |
| Attenuation Control | 50 mA |
ELECTRICAL CHARACTERISTICS
(Frequency: 800 MHz to 1000 MHz, Tc
= +25°C)
| Minimum
Insertion Loss |
10
dB |
| Typical
Attenuation Range |
20
dB |
| Input
VSWR |
1.25
: 1 |
| Output
VSWR |
1.5
: 1 |
| Input
Third-Order Intercept |
>
40 dBm |
| Variation of Time Delay with
Attenuation Range of 10 to 20 dB is ± 100 psec |
|
PIN ASSIGNMENT
| Pin # | Function |
| 9 | In-phase Attenuator Control (I1) |
| 7 | RF Input |
| 1 | Quadrature
Attenuator Control (Q1) |
| 18 | Quadrature
Attenuator Control (Q2) |
| 14 | RF
Output |
| 10 | In-phase
Attenuator Control (I2) |
| All Others | Ground |
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