• HSMS-282x Family: for large signal (>-20 dBm) detectors < 4 GHz
• HSMS-282x Family: for small signal (<-20 dBm) detectors < 1.5 GHz
• HSMS-286x Family: for large signal (>-20 dBm) detectors 4 GHz - 12 GHz
• HSMS-286x Family: for small signal (<-20 dBm) detectors 1.5 GHz - 12 GHz
• HSCH-53xx Family: for microwave applications
• HSCH-9401 Family: for millimeter wave applications to 50 GHz

  Recommended Products: N type Schottky diodes

Key Parameters:

Bias Current (I_d):

HSMS-282x Family: 10 uA

HSMS-286x Family: 3.5 uA

HSCH-53xx Family: 20 uA

(Gamma or voltage sensitivity):

10 - 30 mV/mW range at 6 GHz.

(Matching Q prevents the higher g of biased diodes from being realizable at 900 MHz; however the difference is achievable at 6 GHz.)

HSMS-282x Family: 45 mV/uW at 500 MHz

HSMS-286x Family: 30 mV/uW at 2.45 GHz

HSCH-53xx Family: 6.6 mV/uW at 10GHz

TSS (Tangential Sensitivity):

HSMS-282x Family: -57 dBm at 500 MHz

HSMS-286x Family: -57 dBm at 2.45 GHz

HSCH-53xx Family: -54 dBm at 10 GHz

R_v (Video Resistance):

HSMS-282x Family: 2.6 kohm typ @ 10 uA

HSMS-286x Family: 8.0 kohm typ @ 3.5 uA

HSCH-53xx Family: 1.4 kohm typ

Flicker noise

noise corner > 10 kHz

best choice for low flicker noise: HSMS-281x

• HSMS-285x Family: for small signal (<-20 dBm) detectors < 1.5 GHz
• HSMS-282x Family: for large signal (>-20 dBm) detectors < 4 GHz
• HSMS-286x Family: for large signal (>-20 dBm) detectors 4 to 12 GHz
• HSCH-9161: for millimeter wave applications

  Recommended Products: P type Schottky diodes

Key Parameters:

(Gamma or voltage sensitivity):

HSMS-282x Family: 1 V/10 dBm at 1.8 GHz

HSMS-285x Family: 30 mV/uW at 2.45 GHz

HSCH-9161: 0.5 mV/uW at mmw

TSS (Tangential Sensitivity):

HSMS-285x Family: -56 dBm at 2.45 GHz

R_v (Video Resistance):

HSMS-285x Family: 8 kohm typ

HSCH-9161 Family: 11.8 - 7.5 kohm

Flicker noise

Zero Bias Si Schottkys have an "ultra low" noise corner: < 1 kHz

Detector Diode Terms

Flicker noise

:

What:

Flicker noise sets the noise "corner frequency"; a high noise corner adds "close in" distortion and can interfere with high speed data.

Goodness:

lower flicker noise is better.

Junction capacitance (C_j)

What:

The junction capacitance associated with the diode, equal to the total capacitance C_T minus any other parasitic capacitance such as package parasitic capacitance.

Goodness:

lower is better.

Series resistance of a Schottky diode (R_s)

What:

Schottky diode resistance may be expressed as a series resistance R_s or as a dynamic resistance R_D. These two terms are related by the equation R_D = R_s + R_j, where R_j is the resistance of the junction. Junction resistance of a diode with DC bias is quite accurately calculated by R_j = 26/I_b where I_b is the bias current in milliamperes. Either resistance is a measure of the "loss" in the diode.

Goodness:

lower is better.

Tangential Signal Sensitivity (TSS)

What:

Tangential Signal Sensitivity measures the ability of the diode to distinguish a small signal from noise. The name relates to a type of radar display with the bottom of the signal pulse tangent to the top of the noise level. The value depends on diode noise as well as detection capability.

Video Resistance (R_v)

What:

Video resistance is important for video amplifier and response time considerations. The video amplifier resistance, R_L, should be large compared to the video resistance, R_v, because maximum output voltage is degraded by the factor R_L/(R_L+R_v).

Voltage sensitivity ()

What:

the output voltage (per milliwatt of incident RF power) that the diode produces when irradiated ("painted") by an RF signal.

Goodness:

is a function of the physical diode parameters I_s, R_s, and C_j Lower R_s (series resistance) yields higher sensitivity. Lower C_j (junction capacitance) yields higher sensitivity. Higher I_s (saturation current) yields higher sensitivity for Zero Biased Detectors, but is not a factor in biased applications where it is swamped out by the bias current.

To achieve full sensitivity, a diode must be impedance matched to the antenna. As diode impedances are very large, the losses associated with this high Q match may limit the achievable sensitivity value to a number significantly lower than the theoretical .