HMC1020LP4E Datasheet, PDF (20/22 Pages) Hittite Microwave Corporation – RMS POWER DETECTOR SINGLE-ENDED, DC - 3.9 GHz

v02.0511
HMC1020LP4E
RMS POWER DETECTOR
SINGLE-ENDED, DC - 3.9 GHz
Intercept Adjustment
4.5
4
Rset = 24 Kohm
Rfbk = 4.7 Kohm
3.5 Rshunt = 2.2 Kohm
3
2.5
2
1.5
VBLINE = -3.2 V
VBLINE = -1.6 V
1
VBLINE = -0.8 V
VBLINE = 0 V
VBLINE = +0.8 V
0.5
VBLINE = +1.6 V
VBLINE = +3.2 V
0
-70 -60 -50 -40 -30 -20 -10
0
10
INPUT POWER (dBm)
11
DC Offset Compensation Loop
Internal DC offsets, which are input signal dependant, require continuous cancellation. Offset cancellation is a critical
function needed for maintenance of measurement accuracy and sensitivity. The DC offset cancellation loop performs
this function, and its response is largely defined by the capacitance (COFS) connected between COFSA, COFS pins.
C_OFS capacitor sets the loop bandwidth of the DC offset compensations. Higher C_OFS values are required for measuring
lower RF frequencies. The optimal loop bandwidth setting will allow internal offsets to be cancelled at a minimally
acceptable speed.
DC Offset Cancellation Loop ≈
Bandwidth , Hz
For example: loop bandwidth for DC cancellation with COFS = 1nF, bandwidth is ~62 kHz
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: [phone] Fax: [phone] Order On-line at www.hittite.com
Application Support: Phone: [phone] or [e-mail]
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