high-dynamic-range vga with temperature compensation and linear-in-db gain control
DESCRIPTION
Sistemi Elettronici Integrati – B17. High-dynamic-range VGA with temperature compensation and linear-in-dB gain control. Francesco Carrara and Giuseppe Palmisano Radio Frequency Advanced Design Center (RF-ADC). Università di Catania Facoltà di Ingegneria DIEES Catania - ITALY. - PowerPoint PPT PresentationTRANSCRIPT
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
High-dynamic-range VGA with High-dynamic-range VGA with temperature compensation and temperature compensation and
linear-in-dB gain controllinear-in-dB gain control
Francesco Carrara and Giuseppe Palmisano
Radio Frequency Advanced Design Center (RF-ADC)
Università di CataniaFacoltà di IngegneriaDIEESCatania - ITALY
STMicroelectronicsCatania site
Sistemi Elettronici Integrati – B17
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
INTRODUCTIONINTRODUCTION Requirements for WCDMA TX Requirements for WCDMA TX
VGAsVGAs
Wide dynamic range (as high as 74 dB for Class 3 user equipment)
Temperature compensation for accurate control over such a wide dynamic range
Decibel-linear gain characteristic to minimize the resolution of the DAC driving the control terminal
High linearity to comply with ACLR specification
TX VGAs are crucial in optimizing the channel capacity of code-division systems like WCDMA
Main requirements are:
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
CIRCUIT DESIGNCIRCUIT DESIGNVGA VGA schematicschematic Linear-in-dB gain control
though exponential variation of the tail current
Temperature compensation (PTAT control current ICTRL)
Parasitic path compensation (dummies Q9-Q10) for extended dynamic range
46-GHz-fT 0.8-μm silicon bipolar process by STMicroelectronics
T
CTRLC
1
2
12E
11E
E
L
1
11C
E
L
V
IRexp
I
I
A
A
R
R
I
I
R
RG
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
EXPERIMENTAL RESULTSEXPERIMENTAL RESULTSGain control characteristicGain control characteristic
VCC = 3 V, f = 400 MHz, Pin = -10 dBm
T = 30 °C
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
EXPERIMENTAL RESULTSEXPERIMENTAL RESULTSPerformance summaryPerformance summary
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
TO PROBE FURTHERTO PROBE FURTHERRelated publicationsRelated publications
F. Carrara and G. Palmisano, “High-dynamic-range VGA with temperature compensation and linear-in-dB gain control,” IEEE J. Solid-State Circuits, vol. 40, pp. 2019-2024, Oct. 2005.
F. Carrara, C. Santagati, and G. Palmisano, “High-dynamic-range VGA with temperature compensation and linear-in-dB gain control,” in Proc. IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM 2004), Montréal, Canada, Sept. 2004, pp. 184-187.
C. D. Presti, F. Carrara, and G. Palmisano, “Variable-gain up-conversion mixer with current reuse for 5-GHz W-LAN applications,” in Proc. European Conf. on Circuit Theory and Design (ECCTD 2005), Cork, Ireland, Aug. 2005, vol. 1, pp. 249-252.