Máy phát vector Advantex AVM4 100MHz-4GHz

Name: Máy phát vector Advantex AVM4 100MHz-4GHz
Brand: Advantex
SKU: AVM4
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AVM4

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Máy phát vector hãng Advantex

Các thông tin chính và thông số kỹ thuật máy phát vector hãng Advantex AVM4 tần số hoạt động từ 100MHz-4GHz

Distinctive Features of AVM4 Vector Modulator

High output power
Wide I/Q bandwidth
Precise output level control
Output filtering
Adjustment of LO suppression
Small size
Low cost

Brief Description

Advantex AVM4 100 MHz - 4 GHz Quadrature Modulator is is designed to generate a modulated signal at the carrier frequency. It can be applied in testing and debugging of digital communication receivers, as well as for digital modulators which form complex I/Q-signal for later transfer to the carrier frequency.

Figure 1 shows the block diagram of quadrature modulator, the main block of the instrument. Signal from the LO input is fed to the phase-shifter, one output of which is shifted by +45° and multiplied by the signal from the I input, the other shifted by −45°, – multiplied from the Q input. Then these signals are added and fed to the filter block, which suppress the LO products, i.e. 2f_LO, 3f_LO, etc. The resulting signal is fed to the APC (Automatic Power Control) block, then – to the RF Out output.

The instrument has USB and RS-232 interfaces for SCPI remote control and firmware updating capability.

Key Features of AVM4 RF Vector Modulator

Output frequency range: 100 MHz – 4 GHz
I/Q bandwidth: DC - 500 MHz
I/Q input level (typ.): 0.8 Vpp @ 50Ω
I/Q sideband suppression (calibrated): −40..−60 dB
Output P_1dB: +20 dBm
Output level range: −30..+20 dBm
Absolute level accuracy (typ.): ±0.2 dB
Output level resolution: 0.05 dB
Output IP₃: +27 dBm
Noise floor: −120 dBm/Hz @ P_OUT=0 dBm
Input LO level: −10..+10 dBm
LO suppression (calibrated): −60 dBm
Remote control: RS-232, USB
Command set: SCPI
Dimensions: H x W x D: 2U x 42HP(½ 19”) x 315 mm

Applications of Advantex AVM4 I/Q-Modulator

Figure 2 shows an example of instrument application. Signal generator with required carrier frequency is connected to the LO input. Base-band generator outputs or two channels of AWG (Arbitrary Waveform) generator are fed to I and Q inputs. Signal from RF Out is fed to the receiver under test.

Test & Measurement Automation

External control interfaces (RS-232, USB) combined withSCPI protocol allow to use low-cost RF signal generator in ATE applications in volume production as well as in education laboratories where equipment is usually combined to one complex controlled by PC.

Parameter	Conditions	min.	typ.	max.	Unit
Frequency bandwidth	−3 dB cutoff	40		4400	MHz
Level range		−30		+20	dBm
Level resolution			0.05		dB
Absolute level accuracy	−10≤P_OUT≤+10 dBm		±0.1	±0.3	dB
Absolute level accuracy	within calibration area		±0.2	±0.5	dB
Temperature effect			0.01		dB/°C
Calibration area	high bound	+13		+18	dBm
Calibration area	low bound	−20		−15	dBm
Output P_1dB	2 GHz	+18	+20		dBm
Output IP₃	100 MHz to 4 GHz		+27		dBm
VSWR (RF Out @ 50Ω load)			1.9
Level settling time			100		ms
RF Out ON/OFF switching time	from edge of triggering signal		0.1		ms
Noise floor	100 MHz		−117		dBm/Hz
	1 GHz		−124
	4 GHz		−128
2-nd harmonics & LO products @ P_OUT=0 dBm	100 MHz		−31		dB
	1 GHz		−44
	4 GHz		−44
3-rd harmonics & LO products @ P_OUT=0 dBm	100 MHz		−43		dB
	1 GHz		−66
	4 GHz		−85
Acceptable DC voltage at RF Out		0		8	V
RF Out level @ OFF state		−40		−60	dBm

Actual signal level vs. frequency at various levels set to the instrument

LO Input Specifications of Advantex AVM4 I/Q-Modulator

Parameter	Conditions	min.	typ.	max.	Unit
Frequency range		100		4000	MHz
VSWR (LO input @ 50Ω)	500 MHz to 4 GHz		1.5
VSWR (LO input @ 50Ω)	100 MHz to 500 MHz			3
LO input level		−10		+10	dBm
LO to RF Out suppression	uncalibrated (@ P_LO=0 dBm)	−60	−40	−25	dB
LO to RF Out suppression	calibrated			−60	dB

I/Q Input Specifications of Advantex AVM4 Vector Modulator

Parameter	Conditions	min.	typ.	max.	Unit
Frequency bandwidth	may be reduced by output filter	DC		500	MHz
VSWR (I/Q inputs @ 50Ω)	@ 100 MHz		1.1
Flatness	DC to 100 MHz, F_LO>500 MHz		1.5		dBpp
Flatness	full I/Q BW			6	dBpp
Sideband suppression	uncalibrated (@ P_LO=0 dBm)	−60	−40	−20	dB
Sideband suppression	calibrated		−60		dB
I/Q inputs two-tone IMD₃ @ V_IQ=0.8 Vpp	f_IQ=200 MHz		−40		dB
I/Q input level	@ 50Ω load		0.8	1.6	Vpp
I/Q gain imbalance			0.02		dB