REP029: MAX3510 Cable Upstream Amplifier Harmonic Distortion Performance to 55MHz
Rapid engineering prototypes are real circuits that Maxim application
engineers have built and measured in our labs. They can provide
a starting point for new RF designs. They are not available as evaluation
kits.
Objective: To complete a set of harmonic distortion tests for MAX3510, from 15MHz to 55MHz (extended band).
A set of single-tone tests and a set of two-tone tests for third-order distortion were successfully conducted on the MAX3510 amplifier. The test tone centers were 15MHz, 25MHz, 35MHz, 45MHz, and 55MHz and VCC was varied 4.50 to 5.00 VDC, with the target between 4.75 and 5.00 VDC. The target was tested for no greater than -46dBc IMD or single-tone harmonics.
The single tone harmonic distortion was tested and essentially met at +59dBmV output level. Degradation occurred with brown-out VCC at 4.5V, and with highest gain at highest frequency.
The two-tone test limit condition was tested and essentially met at +56dBmV per-tone output. The input level was varied from 34dBmV (i.e. -13dBm) to 27dBmV (i.e. - 20dBm) with output constant. Some degradation occurred at 4.50 VCC and highest gain.
The MAX3510 is a programmable power amplifier for use in CATV upstream (e.g. cablemodem) applications. It outputs up to 64dBmV (continuous wave) through a 2:1 (voltage ratio) transformer and operates over a frequency range of 5MHz to 65MHz. It features variable gain controlled by a 3-wire digital serial bus. Gain control is available in 1dB steps. Other features include: ultra-low power-up/down transients, low transmit output noise floor, low transmit-disable output noise and two power-down modes.
Two-tone Third Order Distortion Frequency and VCC Sweep Test Results Performed at Room Temperature:
Result1 (PDF, 17K),
Result2 (PDF, 18K),
Result3 (PDF, 18K),
Result4 (PDF, 18K),
Result5 (PDF, 18K)
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