Functional Description
The PMB2201 is a modulator and mixer circuit with high integration level. It includes a direct quadrature modulator and a double balanced Gilbert cell mixer with according bias circuitry.
The up/down conversion mixer combines two external signals at the RF and IF inputs. The IF input is suited for the lower frequency signal because of its linear transfer function to the mixer output. The higher frequency signal is fed to the RF input to switch the Gilbert cell mixer. In a typical application the wanted mixer output product is bandpass filtered and then fed to the modulator LO input. The mixer may also be used to convert the modulator output signal from E/EX via the IF/IFX input by mixing with a local oscillator signal RF/RFX to higher frequencies up to 2.5 GHz.
The modulator generates two orthogonal carriers which are mixed with the baseband modulation signals A and B in Gilbert multipliers. The outputs of the Gilbert cells are added and amplified by a linear output stage. The modulated signal is available at the open collector output E,EX. The voltage TREF can be used for DC biasing of the modulation inputs A, AX, B, BX externally.
The modulator and the mixer have separate power supplies and grounds. They can be powered down independently. Due to the power down concept the modulator can be used without or in conjunction with the up/down conversion mixer part.
For applications in the frequency range from 1.4GHz to 2.5GHz the derivative PMB2202
is offered.

Features
*Direct quadrature modulator with separate additional double balanced active mixer
*Direct quadrature modulation
*LO frequency range from 800 MHz to 1.5 GHz
*Generation of orthogonal carriers without external elements and without trimming
*typ. 40 dB carrier rejection, typ. 44 dB SSB rejection
*typ. 43 dB rejection of third order products at 1 Vpp A/B drive level at fLO = 1.5 GHz
*3 dBm output power with appropriate output power matching network and at 1Vpp A/B baseband drive level
*Double balanced Gilbert cell mixer
*RF and IF frequency range from DC to 2.5 GHz
*typ. 39 dB carrier rejection
*low noise
*Supply voltage range from 2.7 V to 4.5 V
*Power down mode
*P-TSSOP-24 package
*Temperature range -30° to 85°C

Applications
*Vector modulated digital mobile cellular systems as GSM, PDC-800, PDC-1.5, DAMPS etc.
*Various modulation schemes, such as PM, PSK, FSK, QAM, QPSK, GMSK etc.
*Analog systems with FM and AM modulation
*Space and power saving optimizations of existing discrete transmitter circuits
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