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Differential Amplifier
VWA-40-DIA-SD
DC – 40 Gb/sDescription
The VWA 50030 AA chip is a limiting - high gain
differential amplifier for high data rate application,
typically 10 to 40 Gb/s. The chip is designed in 0.18µm
SiGe BiCMOS 150 GHz process.

Ordering information
Part Number: VWA 50030 AA

The chip can be used in various ways:

Main Features

 Single ended input to differential output
transformer, by grounding through a capacitor
one of the inputs.
 Limiting amplifier, using the high linear gain tosaturate the input signal.
 Cross point control which can be done byadjusting the DC levels between the twoinputs.
The amplifier is a 6 stages amplifier, giving typically
60dB linear gain. When in saturation, the output
amplitude is 400 mV pp single ended (800 mVdifferential pp).







SiGe BiCMOS - Ft = 150GHz
Data rate up to 25Gb/s
3 V / 480 mW typical bias @ 27°C
Single or differential input / output
Input amplitude: 300mV pp
Output amplitude: 800mV pp diff (400mV on each50Ωoutput)
 Temperature compensated ON and OFF state through an enable pin control

Functional Block Diagram

The different parts of the chip are internally biasedusing a voltage and currents reference circuit(Bandgap), in order to have the overall RF
characteristics of the chip (especially the output
amplitude), insensitive to the voltage supply, thetemperature and the process spread. An enable input
control pin is used to switch the chip ON or OFF.
Three separate pins are used to bias the chip: one
dedicated to the reference circuit, the second for theamplifier core (input buffers and amplifier core) and thelast for the 50Ωoutput driver. The 3 bias inputs can beseparately filtered / decoupled in order to optimize theoverall chip performances.

Applications

 Limiter.
 Single to differential transformation.
 Cross point control.

Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
 + 33 (0)619 870 560
+33 (0)139 564 012
mail : info@vectrawave.com
VWA 50030 AAAA DS Rev 0.11

VectraWave Proprietary information subject to change without notice September 09

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Chip pin out

NameType

Descriptionenable

Digital input

Chip enable: switches the chip ON or OFF.

Gnd1*

Bias in/out

Ground for the driver output stage. To be used with Gnd2 as ground plane for coplanar access.

DriverOut

RF output

RF signal out. The driver uses a 50Ωresistor load in order to be consistent with 50Ω: has to be loaded if
not used.

VCCDriver

Bias in/out

Positive bias for the driver output stage. The DC common output level to the output is directly dependent
to this value.

DriverOut

RF output

RF signal out. The driver uses a 50Ωresistor load in order to be consistent with 50Ω: has to be loaded if
not used.

Gnd2*

Bias in/out

Ground for the driver output stage. To be used with Gnd1 as ground plane for coplanar access.

Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
 + 33 (0)619 870 560
+33 (0)139 564 012
mail : info@vectrawave.com
VWA 50030 AAAA DS Rev 0.11

VectraWave Proprietary information subject to change without notice September 09

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Snglx

Digital out

High (VCC) if no input signal

Sngl

Digital out

High if input signal: Snglx complementary

VCC_Coder

Bias in/out

Main chip bias: biases the chip drivers, the amplifier core and the first driver stages.

VCC_bgBias in/out

Chip reference voltage and current bias. Is separated from the main bias to ensure a proper DC filtering

Gnd_bgBias in/out

Chip reference voltage and current ground. Is not physically connected to the RF grounds.

Gnd3*

Bias in/out

Ground for input signal access. To be used with Gnd4 as ground plane for coplanar access.

Nrz_inRF input

Digital signal input. DC is present on the access. Has to be DC decoupled from the external sourceby an external capacitor. Is 100Ω differential referenced to Nrz_inx.

Nrz_inx

RF inputComplementary digital signal input. DC is present on the access. Has to be DC decoupled from theexternal source by an external capacitor. Is 100Ωdifferential referenced to Nrz_in.

Gnd4*

Bias in/out

Ground for input signal access. To be used with Gnd3 as ground plane for coplanar access.

 All pads are octogonal (w / l µm²) = 66 / 105; except VCC_Coder = 75 / 105
 Die thickness = 0.28 mm (11 mils)
 No metallization on back side

Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
 + 33 (0)619 870 560
+33 (0)139 564 012
mail : info@vectrawave.com
VWA 50030 AAAA DS Rev 0.11

VectraWave Proprietary information subject to change without notice September 09

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Electrical specifications
Electricalparameters

Conditions

Symbol

Min.

Typ.

Max.

Unit

Chip bias
Supply voltage

VccCoder – VccBG

Vcc

VccDriver
Current
consumption

V

3
2.5

3

4

V

VccCoder; enable=0;
T=27°C

VccCoder0

VccBG; enable=0; T=27°C

VccBG0VccDriver; enable=0;
T=27°C

VccDriver0

27pA

Current
consumption

VccCoder; enable=1

VccCoder1

90mA

ON mode*VccBG; enable=1

VccBG1

VccDriver; enable=1

VccDriver1OFF mode*nA3(100°C) 0.01

15(-40°C) 2(- 40°C) 28(100°C) 2.5uAmA16mA100Ω300mVpp

Data input (Nrz_in and Nrz_inx)
Input impedance

Single and differential
modes

Amplitude range**

Single or differential input

Zin

2Frequency range***

040GHzDriver Output
Output impedance

Single / Differential

50 / 100ΩCommon mode
voltage

Referred to VCCDriver

VCCDriver0.350

VAmplitude

Single400mVpp* OFF  enable =“0”, ON  enable=“1”** The Min value corresponds to the value which saturates the Driver output.
*** The frequency range is limited for low frequency, by the external decoupling capacitors.

Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
 + 33 (0)619 870 560
+33 (0)139 564 012
mail : info@vectrawave.com
VWA 50030 AAAA DS Rev 0.11

VectraWave Proprietary information subject to change without notice September 09

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Absolute rating
Parameters

Conditi onsSymbolMin.

Supply voltage

VccCoder – VccBG VccDriver

Vcc

Digital input

enableTyp.

Max.

Unit-0.5

4.6

V-0.5

4.6

VTBC°CMax.

Unit

Storage temperature

ESD protection
Parameters

Conditions

SymbolMin.

Typ.

HBM* rating RF in/out

Clk, NRZin DriverOut

0.9

kV

HBM* rating analog

enable2.3kV

HBM* rating bias

VCC gnd

5.7

kV*Human Body Model

Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
 + 33 (0)619 870 560
+33 (0)139 564 012
mail : info@vectrawave.com
VWA 50030 AAAA DS Rev 0.11VectraWave Proprietary information subject to change without notice September 09

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Application schematicSingle IN, Differential OUT with cross point modification

Handling

These products are sensitive to electrostatic discharge and should not be handled except at a static free workstation.
Take precautions to prevent ESD; use wrist straps, grounded work surfaces and recognized anti-static techniques whenhandling the IC.

Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
 + 33 (0)619 870 560
+33 (0)139 564 012
mail : info@vectrawave.com
VWA 50030 AAAA DS Rev 0.11

VectraWave Proprietary information subject to change without notice September 09

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