CXA1951AQ Просмотр технического описания (PDF) - Sony Semiconductor

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CXA1951AQ

GPS Down Converter

Sony Semiconductor 

CXA1951AQ

Description of Operation

This IC down-converts the GPS (Global Positioning System) frequency of 1.57542 GHz to fo (fo: 1.023 MHz)

or 4fo.

The internal configuration is divided into the analog block, consisting of the amplifier and mixer, and the digital

block (including limiter), which forms the PLL.

The two-stage analog block has an external filter; it converts the frequency and amplifies the signal. The PLL

frequency division ratio can be switched in the digital block in order to down-convert the output signal to fo or

4fo.

1. Oscillator

Transistor and bias circuits are incorporated in this IC. A Colpitts or Hartley oscillator can be configured by

adding an external resonator. Also, the oscillator is a paired circuit so as to enable balanced output.

IC

6

7

8

9

Example of Colpitts Oscillator Configuration (one side)

IC

6

7

8

9

CP

Example of Balanced Configuration

A varactor (variable capacitance) diode, as shown by the dotted line, is added to this IC to configure a VCO,

and the resonant frequency is varied depending on the control voltage of Pin 2 (charge pump output) to CP.

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