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UAA2077 Datasheet(PDF) 5 Page - NXP Semiconductors |
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UAA2077 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 1995 Dec 13 5 Philips Semiconductors Product specification 2 GHz image rejecting front-end UAA2077BM FUNCTIONAL DESCRIPTION Receive section The circuit contains a low-noise amplifier followed by two high dynamic range mixers. These mixers are of the Gilbert-cell type, the whole internal architecture is fully differential. The local oscillator, shifted in phase to 45 ° and 135°, mixes the amplified RF to create I and Q channels. The two I and Q channels are buffered, phase shifted by 45 ° and 135° respectively, amplified and recombined internally to realize the image rejection. Balanced signal interfaces are used for minimizing crosstalk due to package parasitics. The IF output is differential and of the open-collector type. Typical application will load the output with a differential 1k Ω load; for example, a 1 kΩ resistor load at each IF output, plus a differential 2 k Ω load consisting of the input impedance of the IF filter or the input impedance of the matching network for the IF filter. The power gain refers to the available power on this 2 k Ω load. The path to V CC for the DC current should be achieved via tuning inductors. The output voltage is limited to VCC +3Vbe or 3 diode forward voltage drops. Fast switching, ON/OFF, of the receive section is controlled by the hardware input RXON. Fig.3 Block diagram, receive section. handbook, full pagewidth MGD157 LNA IF COMBINER IF amplifier IF amplifier MIXER MIXER RXON LOIN IFA IFB RFINA RFINB LNAGND VCCLNA +45o +135o |
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Similar Description - UAA2077 |
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