| Rapid Engineering Prototypes are actual circuits built by Maxim applications engineers and tested in the lab. These circuits are intended to serve as a starting point for new radio frequency (RF) designs. They are not intended as evaluation test tools. |
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Objective: To optimize the MAX2108 direct-conversion tuner for operation between 950MHz and 1750MHz.
A reference evaluation board has been developed and tested for the MAX2108 satellite digital video broadcast (DVB) tuner chip. Important features of the evaluation board include transmission line input matching circuits, I/Q differential Chebyshev lowpass filters with 0.1dB ripple and 35MHz cutoff frequency, and DC regulators. A pair of MAX4145 video op amps are used as unbalanced to balanced converters (baluns) to terminate the lowpass filters and drive the 50-ohm output test ports. The board is made of low-cost FR4 material and is designed to be easy to test and change. ±8VDC board input power is required to power the op amp unbalanced to balanced converters (baluns).
The board design results meet all data sheet specifications, including greater than 50dB gain range, +8dBm IIP3 and +14dBm IIP2 over the entire band, and 10dB to 13dB NF. Excellent reverse isolation performance is achieved by using a LO unbalanced to balanced converter (balun) and careful layout design, with -87dBm LO leakage power measured at the RF input port.
The MAX2108 is a low-cost direct-conversion tuner chip designed for use in digital, direct broadcast satellite (DBS) TV set-top box units and microwave links. The direct-conversion architecture reduces system cost compared to IF-based architectures. The MAX2108 uses a broadband I/Q downconverter to directly tune L-band signals to baseband signals, providing a typical IIP3 of +8dBm. The operating frequency range is 950MHz to 2150MHz. The MAX2108 includes a low-noise amplifier (LNA) with gain control, two downconversion mixers with output buffers, a 90-degree quadrature signal generator, and a 32/33 prescaler.
Optimized performance indicators operating from 950MHz to 1750MHz
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| Shielding |
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| Vcc |
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(Note 1) |
| Icc |
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| Frequency |
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| RF Power In |
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| Gain-Control Range |
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| IIP3 |
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| Noise Figure |
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| LO Leakage at RFIN Port |
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| Baseband Filter fc |
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Notice:
1. There are linear regulators on board. The Max2108 operates at +5.0V DC and the MAX4145 differential line receiver operates at ±5.0V DC.2. Prf in = -20dBm per tone, GC set to +3.4V. f1rf in = 1749MHz, f2rf in = 1751MHz, fLO = 1740MHz
3. Prf in = -20dBm per tone, GC set to +3.4V. f1rf in = 1200MHz, f2rf in = 2150MHz, fLO = 951MHz, f baseband = 1MHz.
4. GC set to +3.6V.
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