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UAA2077TS Datasheet(PDF) 4 Page - NXP Semiconductors |
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UAA2077TS Datasheet(HTML) 4 Page - NXP Semiconductors |
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4 / 16 page  2000 Apr 17 4 Philips Semiconductors Preliminary specification 2 GHz image rejecting front-end UAA2077TS FUNCTIONAL DESCRIPTION Receive section The circuit contains a low-noise amplifier followed by two high dynamic range mixers (see Fig.3). The mixers are of the Gilbert cell type, the architecture of which is fully differential. The LO signal is phase shifted into 45 ° and 135° signals, mixed with the RF input signal to provide the I and Q channel signals. The I and Q channel signals are buffered, phase shifted by 45 ° and 135° respectively, amplified and internally combined, thus obtaining image rejection. Balanced signal interfaces are used for minimizing crosstalk from package parasitics. The IF output is of a differential open collector type. A typical application consists of pull-up resistors of 680 Ω at each IF output and a differential load resistance of 1 k Ω for the IF filter, due to its impedance or its matching network. The power gain refers to the resulting power into the 1 k Ω load. The path for the DC current from VCC into the open collector outputs should be realized by the inductors. The output signal is limited to VCC +3VBE. Fast switching between power-down and the RX mode is controlled by the mode control pin RXON. handbook, full pagewidth FCA013 135 ° 16 IF COMBINER 1 6 LNAGND 2, 5, 8 n.c. 10 RXON 4 RFINB 3 RFINA LNA × 45 ° × 15 VCCLNA IFA IFB UAA2077TS to LO section 9 GND Fig.3 Receive section. |
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Similar Description - UAA2077TS |
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