CMX998
CMX998 is Cartesian Feed-back Loop Transmitter manufactured by Consumer Microcircuits Limited.
Features
Applications
- Frequency Range 30MHz to 1GHz
- TETRA Terminals
- Wide Band Noise
- 148d Bc/Hz
- TETRA 2 Terminals
- C-BUS (SPI patible) Serial Interface
- APCO P25 Phase 2
- Gain Control
- Aviation Systems
- Error Amplifier
- Mobile Satellite Terminals
- Up Converter Forward Path
- Linear Modulation Schemes:
- Down Converter for Feedback
QPSK, /4-DQPSK, 8PSK, QAM,
Linearisation
OFDM, F4FM, etc.
- 360° Loop Phase Shift Control
- Direct Interface to CMX981, CMX980A
- DC Offset Measurement Output and CMX7163/CMX7164
- Open Loop Function
- Instability Detector
- Flexible Digital Interface
1 Brief Description
A Cartesian Loop improves the efficiency and linearity of transmitters for non-constant envelope modulation systems.
The CMX998 is an integrated solution for a Cartesian Feedback Loop based linear transmitter. Acting as a direct conversion quadrature mixer from I and Q to RF output, it provides the capability to linearize the Power Amplifier (PA) via feedback from the PA's output. Included are forward and feedback paths; local oscillator circuitry including loop phase control; an instability detector and unmitted op-amps for input signal conditioning.
The device operates from a single 3.3V supply over a temperature range of -40°C to +85°C and is available in a 64-pin VQFN (Q1) package.
© 2021 CML Microsystems Plc
Cartesian Feed-Back Transmitter
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Brief Description
Block Diagram...
