基于TQM879006A下的1.4 −2.7 GHz ¼ W Digital Variable Amplifier

　　Applications

　　• 3G / 4G Wireless Infrastructure

　　• CDMA， TD-CDMA， WCDMA， LTE

　　• Repeaters • PTP Radio IF Chains

　　Product Features

　　• 1.4-2.7 GHz Frequency Range

　　• 31.7 dB Maximum Gain at 2 GHz

　　• 31.5 dB Gain Range in 0.5 dB Steps

　　• +43 dBm Output IP3

　　• +24.5 dBm Output P1dB

　　• 1.5 dB Noise Figure at Max. Gain State

　　• Fully Internally Matched Module

　　• Integrated Blocking Capacitors， Bias Inductors

　　• 3-wire SPI Control Programming

　　General Description

　　The TQM879006A is a digital variable gain amplifier （DVGA） featuring high linearity over the entire gain control range. The amplifier module features the integration of a low noise amplifier gain block， a digitalstep attenuator （DSA）， along with a high linearity ¼W amplifier. The module has the added features of integrating all matching components with bias chokes and blocking capacitors. The internal DSA offers 0.5 dB step， 6-bit， and 31.5 dB range and is controlled with a serial periphery interface （SPITM）。 The TQM879006A features variable gain from 0 dB to 31.7 dB at 2 GHz， has +43 dBm Output IP3， and +24.5 dBm P1dB.

　　The amplifier also has a very low 1.5 dB Noise Figure （at maximum gain） allowing it to be an ideal DVGA for both receiver and transmitter applications. The amplifier operates from a single +5V supply and is available in a compact 28-pin 6x6 mm leadless SMT package.

　　The TQM879006A is pin compatible with the TQM829007 （0.6-1GHz， 0.25W DVGA） and TQM879008 （1.5-2.7 GHz， 0.5W DVGA）。 This allows one to size the right type of device for specific system level requirements as well as making the DVGA family ideal for applications where a common PCB layout is used for different frequency bands.