thhor_crs/gretel.org

• GRETEL
  • Channel map
  • Analog configuration
    • Preamp gain
    • Sallen Key
    • Shaper
      • High Gain
      • Low Gain

GRETEL

Channel map

ADC	Ch	det	shaper	gain	pin	csa	PA gain
A	0	HETB1L	A	1×	13	L33	4.3pF⁻¹
A	1	HETA1L	B	1×	14	L31(32)	4.3pF⁻¹
A	2	HETA1H	C	15×	15	L31	4.3pF⁻¹
B	0	BGO1L	A	1×	18	L39(40)	1pF⁻¹
B	1	BGO1H	B	15×	19	L39	1pF⁻¹
B	2	BGO2L	C	1×	17	L41	1pF⁻¹
C	0	BGO2H	A	15×	16	L41(42)	1pF⁻¹
C	1	HETA2H	B	15×	8	L37(38)	4.3pF⁻¹
C	2	HETB2L	C	1×	10	L35(36)	4.3pF⁻¹
D	0	HETB1H	A	15×	12	L33(34)	4.3pF⁻¹
D	1	HETB2H	B	15×	11	L35	4.3pF⁻¹
D	2	HETA2L	C	1×	9	L37	4.3pF⁻¹

Analog configuration

Preamp gain

• BGO: C₂= 1pF, R₂= 100MΩ
• HET: C₂= 4.3pF, R₂= 22MΩ

Sallen Key

• a = 1.47 = C20/C21
• b = 0.46 = R22/R23 = a - 1
• τ = 2.7µs = R20×C20 = R21×C21
• R20 = 27kΩ
• R21 = 39kΩ
• C20 = 100pF
• C21 = 68pF
• R22 = 1kΩ
• R23 = 2.2kΩ

Shaper

• τ = 2.7µs = R1×C1 = R3×C3
• τ0 = 100µs = C1×R0 (pole zero compensation)

High Gain

• a = R3/R1 = 45
• R1 = 220Ω + 47Ω
• C1 = 10nF
• R3 = 12kΩ
• C3 = 220pF
• R0 = 10kΩ

Low Gain

• a = R3/R1 = 3.1
• R1 = 220Ω + 2.4kΩ
• C1 = 1nF
• R3 = 8.2kΩ
• C3 = 330pF
• R0 = 100kΩ