基于TQM879028下的0.7−4.0 GHz ½ W Digital Variable Gain Amplifier

　　Applications

　　3G / 4G Wireless Infrastructure 

　　Repeaters 

　　LTE / WCDMA / CDMA

　　Product Features

　　0.7−4.0 GHz Frequency Range

　　32 dB Maximum Gain at 2.14 GHz

　　31.5 dB Gain Range in 0.5 dB Steps 

　　+44 dBm Output IP3 

　　+27.5 dBm Output P1dB 

　　3-wire SPI Control Programming

　　General Description

　　The TQM879028 is a digital variable gain amplifier （DVGA） featuring high linearity over the entire gain control range. This amplifier module integrates a gain block， a digital-step attenuator （DSA）， and a high linearity ½ Watt amplifier into a compact 4 x 4 mm module. The internal 6-bit DSA provides a 31.5 dB gain control range in 0.5 dB steps， and is controlled with a serial periphery interface （SPITM）。 The individual stages are accessible to external ports to allow for optimization of the last stage amplifier for individual bands and also allowing other functional blocks to be added in-between the stages. The TQM879028 features variable gain from 0.5 dB to 32 dB at 2.14 GHz， +44 dBm output IP3， and +27.5 dBm P1dB while only consuming 230 mA current from a 5 V supply. The module is available in a compact 24-pin 4 x 4 mm leadless SMT package.