Agilent Technologies E4438C manual Specifications for I/Q Characteristics, Baseband generator

Specifications for I/Q Characteristics

Baseband generator

[real-time mode] [Option 601 or 602]

Basic modulation types [custom format]
	PSK	BPSK, QPSK, OQPSK, π/4DQPSK, 8PSK, 16PSK, D8PSK
	MSK	User-defined phase offset from 0 to 100°
	ASK	User-defined depth from 0.001 to 100%
	QAM	4, 16, 32, 64, 128, 256
	FSK	Selectable: 2, 4, 8, 16 level symmetric, C4FM
		User defined: Custom map of up to 16 deviation levels
		Symbol rate	Maximum deviation
		< 5 MHz	4 times symbol rate
		> 5 MHz, < 50 MHz	20 MHz
		Resolution: 0.1 Hz
I/Q	Custom map of 256 unique values
FIR filter
	Selectable	Nyquist, root Nyquist, Gaussian, rectangular, Apco 25
	Custom FIR	a: 0 to 1, BbT: 0.1 to 1
		16-bit resolution, up to 64 symbols long, automatically resampled to

1024 coefficients [max]

>32 to 64 symbol filter: symbol rate ≤ 12.5 MHz

>16 to 32 symbol filter: symbol rate ≤ 25 MHz Internal filters switch to 16 tap when symbol rate is between 25 and 50 MHz

Symbol rate

For external serial data, symbol rate is adjustable

50 Mbits/sec

from 1000 symbols/sec to a maximum symbol rate of

#bits/symbol

For internally generated data, symbol rate is adjustable from 1000 symbols/sec to 50 Msymbols/sec. and a maximum of 8 bits per symbol. Modulation quality may be degraded at high symbol rates.

Baseband reference frequency

	Data clock can be phase locked to an external reference.
	13 MHz for GSM, 250 kHz to 100 MHz in W-CDMA and cdma20001, 2
Input	ECL, CMOS, TTL compatible, 50 Ω AC coupled
Frame trigger delay control
Range	0 to 1,048,575 bits
Resolution	1 bit

1.Performance below 1 MHz not specified.

2.When used, this baseband reference is independent of the 10 MHz RF reference.

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