Cable upstream amplifier MAX3510 / MAX3514 / MAX3516

Adjacent channel power ratio (ACPR) of the cable upstream amplifier MAX3510 / MAX3514 / MAX3516

Abstract: The performance specifications of the cable upstream drive amplifier MAX3510 / MAX3514 / MAX3516 are given in the article. ACPR and gain data are given in the form of graphs and tables. The unit complies with the DOCSIS 2.0 standard. The data is tested in the 5MHz to 65MHz frequency band.

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Measure the adjacent channel power ratio (ACPR) of the MAX3510 / MAX3514 / MAX3516. The test conditions are 5.0V power supply voltage, input signal + 34dBmV. The test results in graphical representation are given. The data conforms to the DOCSIS 2.0 standard.

ACPR is an important parameter of cable amplifiers, because the transmitted carrier may appear on adjacent channels, and this channel will be occupied by carriers with the same or different modulation rates. ACPR is defined as the carrier power ratio of the main channel and the phase-zero channel. According to the DOCSIS standard, a test bandwidth of 160 kHz is used, and the channel spacing is 200 kHz.

The MAX3510 / MAX3514 / MAX3516 are a series of controllable gain upstream amplifiers designed for CATV upstream applications. They operate in the 5MHz to 65MHz band and can drive QPSK signals (MAX3516) up to + 64dBmV. Because both input and output are differential, a non-balancer transformer is required outside the output port. The variable gain feature provides a dynamic range above 56dB (MAX3514 / MAX3516), controlled by the SPI 3-wire interface. The gain control is in 0.5dB (MAX3514 / MAX3516) or 1dB (MAX3510) steps.

Test conditions All tests at room temperature VCC = 5.0V-PIN = -13dBm (+ 34dBmV in 50Î© system) Input signal: 20-bit PRBS QPSK modulation signal, root cosine filter, Î± = 0.25 High power mode input ACPR -66dBc 200kHz Channel spacing 160kHz test bandwidth calibration and unit conversion in 50Î© system, PIN / OUT (dBmV) = PIN / OUT (dBm) + 47dB in 75Î© system, PIN / OUT (dBmV) = PIN / OUT (dBm) + 49dB There is 3.5dB loss at the output, so POUT (dBmV) = POUT (dBm) + 47dB + 3.5dB + cable loss. The MAX3514 / MAX3516 EV kit has at least 7.5dB loss at the output, so POUT (dBmV) = POUT (dBm) + 47dB + 7.5dB + Cable loss test equipment list Signal generator (RODHE & SCHWARZ SMIQ 06B) capable of generating QPSK signal Spectrum analyzer (RODHE & SCHWARZ FSEB) Power meter (HP437B) Power detector (HP8482A) Power supply (Agilent E3632A ) Digital Multimeter (HPE3631A)

Figure 1. Test equipment
Click on the big picture 1. Test equipment

figure 2.

Table 1. Correspondence between MAX3510 ACPR and output power and frequency

	Input (dBm)	GCW	Output (dBm)	Output (dBmV)	ACPR (dBc)
5MHz	-13	49	4.41	51.41	-66
	-13	52	7.16	54.16	-66
	-13	55	9.92	56.92	-64.5
	-13	59	13.59	60.59	-61.2
	-13	61	15.5	62.5	-51.8
	-13	63	17.03	64.03	-42
20MHz	-13	49	4.03	51.03	-66
	-13	52	6.82	53.82	-65.3
	-13	55	9.59	56.59	-64
	-13	59	13.29	60.29	-60.3
	-13	61	15.19	62.19	-51.7
	-13	63	16.72	63.72	-42.2
42MHz	-13	50	4.30	51.30	-66
	-13	53	7.29	54.29	-63.6
	-13	56	10.06	57.06	-61.5
	-13	59	12.81	59.81	-58.6
	-13	61	14.76	61.76	-50.1
	-13	63	16.29	63.29	-41.8
65MHz	-13	50	3.95	50.95	-65.5
	-13	53	6.73	53.73	-62.6
	-13	56	9.5	56.5	-59.6
	-13	59	12.26	59.26	-56.9
	-13	61	14.24	61.24	-50.1
	-13	63	15.76	62.76	-40.5

image 3.

Table 2. Correspondence between MAX3514 ACPR and output power and frequency

	Input (dBm)	GCW	Output (dBm)	Output (dBmV)	ACPR (dBc)
5MHz	-13	114	9.17	56.17	-66
	-13	120	12.15	59.15	-66
	-13	122	13.14	60.14	-66
	-13	125	14.61	61.61	-66
20MHz	-13	114	9.1	56.1	-66
	-13	120	12.1	59.1	-65
	-13	122	13.09	60.09	-64.5
	-13	125	14.56	61.59	-63.4
42MHz	-13	110	6.85	53.85	-66
	-13	114	8.9	55.9	-64.2
	-13	120	11.87	58.87	-62.9
	-13	122	12.86	59.86	-62.9
	-13	125	14.32	61.32	-61.2
65MHz	-13	112	7.13	54.13	-66
	-13	116	9.11	56.11	-61.5
	-13	122	12.04	59.04	-59.8
	-13	124	13.01	60.01	-58.5
	-13	125	13.5	60.5	-58.2

Figure 4.

Table 3. Correspondence between MAX3516 ACPR and output power and frequency

	Input (dBm)	GCW	Output (dBm)	Output (dBmV)	ACPR (dBc)
5MHz	-13	116	13.39	60.39	-66
	-13	120	15.34	62.34	-64.2
	-13	122	16.31	63.31	-63.8
	-13	125	17.68	64.68	-51.6
20MHz	-13	116	13.41	60.41	-66
	-13	120	15.38	62.38	-64.4
	-13	122	16.38	63.36	-61.9
	-13	125	17.74	64.74	-51.2
42MHz	-13	12	11.01	58.01	-66
	-13	116	12.94	59.94	-63.2
	-13	120	14.9	61.9	-61
	-13	122	15.87	62.87	-58.7
	-13	125	17.23	64.23	-48.7
65MHz	-13	112	10.10	57.10	-65
	-13	116	12.18	59.18	-59.4
	-13	120	14.11	61.11	-57.7
	-13	122	15.07	62.07	-55.3
	-13	125	16.42	63.42	-47.4

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