SL2030

The SL2030 is a bipolar, broadband wide dynamic range mixer oscillator, optimised for applications as an upconverter in double conversion tuner systems. It also has application in any system where a wide dynamic range broadband frequency converter is required.

The SL2030 is a single chip solution containing all necessary active circuitry and simply requires an external tuneable resonant network for the local oscillator. The block diagram is shown in Figure 1 and pin connections are shown in Figure 2.

In normal application the high IF output of SL2030  is interfaced through appropriate impedance matching to the high IF filter. The RF input preamplifier of the device is designed for low noise figure within the operating region and for high intermodulation distortion intercept so offering good signal to noise plus composite distortion spurious performance.

The preamplifier SL2030 also provides gain to the mixer section and back isolation from the local oscillator section. The approximate model of the RF input is shown in Figure 3.

The output of the preamplifier  SL2030is fed to the mixer section which is optimised for low radiation application. In this stage the RF signal is mixed with the local oscillator frequency, which is generated by an on-chip oscillator. The oscillator block of SL2030 uses an external tuneable network and is optimised for low phase noise. A typical application is shown in Figure 6 and the typical phase noise performance in Figure 5. This block also contains a buffer-amplifier to interface with an external PLL to allow for frequency synthesis of the local oscillator.of SL2030

The IF output of SL2030 must be loaded differentially in order to get best intermodulation performance. The approximate model of the IF output is shown in Figure 4.

In application care of SL2030 should be taken to achieve symmetric balance to the IF outputs to maximise intermodulation performance.