Rapid engineering prototypes (rapid engineering prototypes) are actual circuits that Maxim application engineers build and conduct product testing in the laboratory. They are the starting point for new RF engineering designs. They are not used as evaluation test tools. More information: Wireless product webpage quick browsing MAX3509 data data application technical support Objective: Modify the MAX3509 CATV upstream amplifier to achieve a higher output. Many cable phone manufacturers require high output upstream amplifiers to overcome coupler losses. Manufacturers may need amplifier output of 67dBmV to 68dBmV to overcome the loss of duplexers and couplers. Using a 1: 2 (voltage) step-up output transformer and a 35.5Ω series output resistor, the MAX3509 has good return loss characteristics in the operating state and meets the DOCSIS's off-state return loss after the duplexer and coupler Claim. In a typical system, the duplexer has a 1dB loss, and the coupler has a 6dB loss. Therefore, the entire DUT has a total loss of 7dB. The MAX3509 is a cable upstream amplifier that operates in the frequency range of 5MHz to 65MHz. It has a variable gain control (VGA) controlled by a 3-wire digital serial bus with a gain control accuracy of 1dB. It can provide a low-impedance amplified output, and its output matching and driving power have great flexibility. The MAX3509 outputs a 66dBmV QPSK signal through a 1: 1 transformer. It also has a transmit-off mode and a low-power mode. The MAX3509 is available in a 20-pin TSSOP-EP package and can operate over an extended industrial temperature range (-40 ° C to + 85 ° C).

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