|Category||Power Management => Power Factor Controllers|
|Description||DC-50 GHZ Variable Attenuator|
|Company||Agilent Technologies, Inc.|
|Datasheet||Download HMMC-1002 datasheet
Features Specified Frequency Range: DC26.5 GHz Return Loss: 10 dB Minimum Attenuation: 2.0 dB Maximum Attenuation: 30.0 dB
Chip Size: Chip Size Tolerance: Chip Thickness: RF Pad Dimensions: DC Pad Dimensions: x 24.0 mils) µm (±0.4 mils) ± 0.6 mils) x 2.8 mils), or larger x 3.0 mils), or larger
Description The is a monolithic, voltage variable, GaAs IC attenuator that operates from to 50 GHz. It is fabricated using MWTC's MMICB process which features an MBE epitaxial layer, backside ground vias, and FET gate lengths of approximately 0.4 mm. The variable resistive elements of the HMMC-1002 are two 750 mm wide series FETs and four 200 mm wide shunt FETs. The distributed topology of the HMMC-1002 minimizes the parasitic effects of its series and shunt FETs, allowing the HMMC-1002 to exhibit a wide dynamic range across its full bandwidth. An on-chip DC reference circuit may be used to maintain optimum VSWR for any attenuation setting or to improve the attenuation versus voltage linearity of the attenuator circuit.
DC Voltage to RF Ports V1 Control Voltage V2 Control Voltage DC In/DC Out RF Input Power Min. Ambient Operating Temp. Max. Ambient Operating Temp. Storage Temperature Max. Assembly Temp. (for 60 sec. max.)Notes: 1. Operation in excess of any one of these conditions may result in damage to this device.
V1 Control Current, -4V) V2 Control Current, = -4V) Pinch-Off Voltage, = 0V) (Four 200 µm wide shunt FETs, VDD 1V @ RFin, IDD = 5 mA)Electrical = 50 Parameters and Test Conditions Units Freq. (GHz)
Input/Output Return Loss @ Min. Attenuation Setting, -4 V)
Input/Output Return Loss @ Max. Attenuation Setting, V DC Power Dissipation, -5 V (does not include input signals)
Note: 1. Attenuation is a positive number; whereas, S21 as measured on a Network Analyzer would be a negative number.
Application The HMMC-1002 is designed to be used as a gain control block in an ALC assembly. Because of its wide dynamic range and return loss performance, the HMMC1002 may also be used as a broadband pulse modulator or single-pole single-throw, nonreflective switch. Operation The attenuation value of the HMMC-1002 is adjusted by applying negative voltage V2. At any attenuation setting, optimum VSWR is obtained by applying negative voltage to V1. Applying negative voltage (V2) to the gates of the shunt FETs sets the source-to-drain resistance and establishes the attenuation level. Applying negative voltage (V1) to the gates of the series FETs optimizes the input and output match for different attenuation settings. In some applications, a single setting of V1 may provide sufficient input and output
match over the desired attenuation range (V1). For any HMMC1002 the values of V1 may be adjusted so that the device attenuation versus voltage is monotonic for both V1 and V2; however, this will slightly degrade the input and output return loss. The attenuation and input/ output match of the HMMC-1002 may also be controlled using only a single input voltage by utilizing the on-chip DC reference circuit and the driver circuit shown in Figure 4. This circuit optimizes VSWR for any attenuation setting. Because of process variations, the values of VREF , RREF, and RL are different for each wafer if optimum performance is required. Typical values for these elements are given. The ratio of the resistors R1 and R2 determines the sensitivity of the attenuation versus voltage performance of the attenuator.
Assembly Techniques GaAs MMICs are ESD sensitive. ESD preventive measures must be employed in all aspects of storage, handling, and assembly. MMIC ESD precautions, handling considerations, die attach and bonding methods are critical facFigure tors in successful GaAs MMIC performance and reliability. Agilent application note #54, "GaAs MMIC ESD, Die Attach and Bonding Guidelines" provides basic information on these subjects. Additional References: AN#31, "226.5 Variable Gain Amplifier Using HMMC-5021/22/ 26 and HMMC-1002 GaAs MMIC Components," AN#37, "HMMC1002 Attenuator: Attenuation Control, "AN#44, "DC50 GHz Variable Attenuator: S-Parameters," "HMMC-1002 DC50 GHz Variable Attenuator: Switching Speed Limitations, and "HMMC-1002 50 GHz Attenuator 050 GHz Performance."
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